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Wrth i'r galw gynyddu ar gyfer ystadegau a data i fesur effaith y pandemig COVID19, mae rhaid i ni newid ein harferion casglu a rhyddhau data, gan ganolbwyntio ymdrechion ar ddadansoddiadau ac ystadegau blaenoriaeth. https://llyw.cymru/ystadegau-ac-ymchwil

Darparwr data: Llywodraeth Cymru Ystadegau Gwladol Amcanestyniadau poblogaeth yn ôl blwyddyn ac oedran
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Rhyw[Hidlwyd]
Ardal[Hidlwyd]
Rhyw 1[Hidlo]
Measure1
[Lleihau]Oed[Hidlo]
-
[Lleihau]Oed 1
-
Oed 2
Blwyddyn[Hidlo]
[Lleihau]Pob oedranCliciwch yma i ddidoliPob oedran[Ehangu]Cliciwch yma i ddidoliOedran cymedrig[Ehangu]Cliciwch yma i ddidoliOedran canolrifol
[Lleihau]15 oed ac iauCliciwch yma i ddidoli15 oed ac iau[Lleihau]16 i 64 oedCliciwch yma i ddidoli16 i 64 oed[Lleihau]65 oed a hynCliciwch yma i ddidoli65 oed a hyn
Cliciwch yma i ddidoli0 oedCliciwch yma i ddidoli1 oedCliciwch yma i ddidoli2 oedCliciwch yma i ddidoli3 oedCliciwch yma i ddidoli4 oedCliciwch yma i ddidoli5 oedCliciwch yma i ddidoli6 oedCliciwch yma i ddidoli7 oedCliciwch yma i ddidoli8 oedCliciwch yma i ddidoli9 oedCliciwch yma i ddidoli10 oedCliciwch yma i ddidoli11 oedCliciwch yma i ddidoli12 oedCliciwch yma i ddidoli13 oedCliciwch yma i ddidoli14 oedCliciwch yma i ddidoli15 oedCliciwch yma i ddidoli16 oedCliciwch yma i ddidoli17 oedCliciwch yma i ddidoli18 oedCliciwch yma i ddidoli19 oedCliciwch yma i ddidoli20 oedCliciwch yma i ddidoli21 oedCliciwch yma i ddidoli22 oedCliciwch yma i ddidoli23 oedCliciwch yma i ddidoli24 oedCliciwch yma i ddidoli25 oedCliciwch yma i ddidoli26 oedCliciwch yma i ddidoli27 oedCliciwch yma i ddidoli28 oedCliciwch yma i ddidoli29 oedCliciwch yma i ddidoli30 oedCliciwch yma i ddidoli31 oedCliciwch yma i ddidoli32 oedCliciwch yma i ddidoli33 oedCliciwch yma i ddidoli34 oedCliciwch yma i ddidoli35 oedCliciwch yma i ddidoli36 oedCliciwch yma i ddidoli37 oedCliciwch yma i ddidoli38 oedCliciwch yma i ddidoli39 oedCliciwch yma i ddidoli40 oedCliciwch yma i ddidoli41 oedCliciwch yma i ddidoli42 oedCliciwch yma i ddidoli43 oedCliciwch yma i ddidoli44 oedCliciwch yma i ddidoli45 oedCliciwch yma i ddidoli46 oedCliciwch yma i ddidoli47 oedCliciwch yma i ddidoli48 oedCliciwch yma i ddidoli49 oedCliciwch yma i ddidoli50 oedCliciwch yma i ddidoli51 oedCliciwch yma i ddidoli52 oedCliciwch yma i ddidoli53 oedCliciwch yma i ddidoli54 oedCliciwch yma i ddidoli55 oedCliciwch yma i ddidoli56 oedCliciwch yma i ddidoli57 oedCliciwch yma i ddidoli58 oedCliciwch yma i ddidoli59 oedCliciwch yma i ddidoli60 oedCliciwch yma i ddidoli61 oedCliciwch yma i ddidoli62 oedCliciwch yma i ddidoli63 oedCliciwch yma i ddidoli64 oedCliciwch yma i ddidoli65 oedCliciwch yma i ddidoli66 oedCliciwch yma i ddidoli67 oedCliciwch yma i ddidoli68 oedCliciwch yma i ddidoli69 oedCliciwch yma i ddidoli70 oedCliciwch yma i ddidoli71 oedCliciwch yma i ddidoli72 oedCliciwch yma i ddidoli73 oedCliciwch yma i ddidoli74 oedCliciwch yma i ddidoli75 oedCliciwch yma i ddidoli76 oedCliciwch yma i ddidoli77 oedCliciwch yma i ddidoli78 oedCliciwch yma i ddidoli79 oedCliciwch yma i ddidoli80 oedCliciwch yma i ddidoli81 oedCliciwch yma i ddidoli82 oedCliciwch yma i ddidoli83 oedCliciwch yma i ddidoli84 oedCliciwch yma i ddidoli85 oedCliciwch yma i ddidoli86 oedCliciwch yma i ddidoli87 oedCliciwch yma i ddidoli88 oedCliciwch yma i ddidoli89 oedCliciwch yma i ddidoli90 oedCliciwch yma i ddidoli91 oedCliciwch yma i ddidoli92 oedCliciwch yma i ddidoli93 oedCliciwch yma i ddidoli94 oedCliciwch yma i ddidoli95 oedCliciwch yma i ddidoli96 oedCliciwch yma i ddidoli97 oedCliciwch yma i ddidoli98 oedCliciwch yma i ddidoli99 oedCliciwch yma i ddidoli100 oed a hyn
201831,96332,90234,28134,58034,97735,80237,06937,77937,14536,65937,32935,97335,58534,34633,43032,889562,70932,80334,27335,48038,77540,86241,67040,74739,93742,09041,41741,82142,43440,63640,04039,08137,76037,65837,71536,21936,58836,19837,65037,50735,47532,90432,95833,27534,53235,70238,00540,60742,75441,43643,35342,93344,02443,99145,35145,38144,08943,92242,54441,08140,59939,96938,86937,24536,27537,2941,923,92937,05035,94536,19837,09437,89639,82341,86631,75031,23730,67628,62325,92123,23222,50921,71420,57718,97617,65616,20314,62913,37911,82810,5889,2387,7026,3205,3994,6333,5962,7832,0691,6601,231870417705651,9933,138,63142.1342.48
201930,46632,26933,31334,64334,91135,27036,05437,29537,99537,34936,85637,53036,17135,79634,55433,647564,11933,10833,03934,74036,98540,68941,67141,54040,33139,50541,75141,21841,71242,39740,64740,09239,16437,90437,81837,86436,36236,71436,34737,78437,59735,53732,96433,05233,36934,60435,79338,10540,70642,84641,52543,44843,03344,12744,10445,43645,45344,15643,98142,59041,10640,61139,93338,81337,17136,1581,925,60037,13836,83135,66635,84436,66037,38239,18941,10631,11030,52629,88627,80225,10222,40721,61520,75419,56317,93816,56115,06413,47812,19510,6509,4048,0766,6245,3374,4733,7562,8492,1501,5581,214873597694662,0723,151,79142.2942.49
202031,20930,76232,66833,66434,96635,19735,51336,27137,50538,19637,54337,05237,72336,37836,00234,764565,41333,85733,33333,48936,18338,82941,46341,49541,07439,89339,17241,53541,10541,66842,39140,68840,16839,30238,05837,96338,00236,48436,85736,47637,87437,66235,59333,05333,14033,43834,68935,88838,20240,79942,93041,62143,54443,13844,23544,18945,50845,51844,21844,02642,61041,11740,57339,87238,72837,0411,928,69136,01036,91936,54235,31335,42436,15936,78338,47940,26930,40229,73829,02526,91424,20221,51220,65019,71918,48016,81515,38913,86412,27210,9659,4448,2056,9255,5774,3993,6072,9562,1851,6031,128852591794670,1113,164,21542.4442.49
202131,12831,48031,12732,99133,96235,22935,41835,70836,46037,68838,37637,72437,23037,91736,57236,200565,21034,95934,06333,75034,87037,93939,52941,22440,95340,56539,52738,93541,38541,03341,63342,39540,73740,28139,43638,18538,08538,11036,61436,97436,55537,93337,71635,67533,13633,20233,51434,77335,97338,28840,87943,01541,71443,64043,24444,31444,26245,57445,57644,26644,04642,61741,07740,51139,78338,5901,931,05536,88235,79836,63036,18134,90034,94635,58636,12337,70539,35629,62528,89128,10725,95423,24220,56219,63018,63617,33215,63814,18012,63411,0479,7348,2487,0425,8344,6023,5462,8382,2661,6301,160790576854678,7053,174,97042.5942.53
202230,98031,39031,83031,43433,27434,21335,44235,60535,88736,63437,86338,55337,89537,41838,10636,762563,28636,38635,15334,46135,07136,54538,59839,25240,62940,38940,14339,25638,75741,27740,97241,61442,41740,82940,39739,54538,29338,17938,22836,71937,04036,60237,98137,79435,74833,19033,27033,59234,85236,05138,36440,96543,10041,81043,74243,32144,38444,33145,63645,62344,29044,05342,57641,01740,42439,6441,932,51038,42236,66335,52036,27035,75834,43234,39934,95435,40336,85938,36128,79227,98827,11724,93522,22619,55918,56117,48616,12714,41912,93411,3829,8198,5137,0885,9394,8173,7142,7902,1761,6891,179812534878688,5153,184,31142.7542.64
202330,89531,23531,73132,12631,70533,51534,41835,62335,77836,05436,80138,03338,72038,07837,60338,292560,60736,94236,57235,53935,76436,70637,16438,31938,65540,04639,94839,85239,07338,64841,20640,94741,63342,50340,94040,50439,65038,38438,29538,33036,78537,08836,65238,06037,86935,79933,25633,34433,67034,92836,12438,44941,05543,19241,91743,81843,39444,45044,39945,68645,64644,30244,01042,51240,93140,2861,933,24239,47438,19436,38135,17435,84935,28033,89833,79634,26334,61635,93337,28827,90427,01426,06123,85421,15018,50617,42616,28014,87813,16411,66610,1268,5987,3245,9844,9093,8902,9252,1391,6221,221825548864699,0243,192,87342.9042.78
202430,87131,13431,55632,01032,38131,92833,70634,58835,78435,93236,20836,96038,18838,89238,25237,776556,16638,45837,10836,93036,80437,34237,26336,82637,67238,02239,53939,59339,60838,91738,53541,13640,92841,69042,58841,02240,58839,72238,48338,38238,38036,82037,12236,71938,12737,91235,85233,32033,40833,73734,99236,20038,52941,14643,28841,99343,88443,46144,50944,45145,71045,65344,26243,94442,42040,7901,933,78540,11439,24137,89736,02834,77035,37334,73633,30633,13433,50733,75334,93636,14426,94425,97624,94122,70820,02017,38616,23215,02713,59011,88410,3918,8747,4076,1924,9523,9693,0662,2451,5941,173854557865709,7863,199,73743.0742.93
202530,81431,10331,44331,82732,25732,59632,10933,87034,74635,93536,08136,36037,11038,35739,06138,417552,08637,93438,61437,45638,19338,37137,87036,91236,17937,04637,52339,17439,33839,44038,80138,46341,11040,97741,77042,66641,10140,65839,82038,57038,43338,41636,85637,18636,78438,17137,96535,91433,38433,46933,79835,06236,27638,61841,24443,35842,06443,94843,52644,56044,48045,72345,61244,20143,85042,2731,933,15740,62239,88238,94237,53235,61634,31434,83234,13632,66032,41332,68232,82733,87434,91425,92024,87223,75321,50318,81916,20614,99313,73512,27510,5959,1187,6546,2715,1314,0093,1312,3541,6751,152820576866720,6743,205,91743.2343.05
202630,73931,04731,41231,71432,07432,47232,77632,27034,02634,89636,08436,23236,50937,27738,52639,227547,28138,57438,09038,96438,75639,80238,90237,51436,28335,58236,57037,17638,92239,17339,32238,73138,44141,15841,05741,85042,74641,17240,75939,90638,62038,46738,45036,92137,25036,82938,23038,03135,97633,44833,52933,86835,13736,36338,71641,32243,42542,13544,01143,58244,59044,50245,68845,55044,11443,7031,931,90742,09940,39239,58438,57537,10835,15433,79534,23633,48331,95631,62531,79631,84132,72633,60124,83223,70222,50620,22217,55414,98213,71412,41610,9529,3067,8746,4885,2044,1603,1682,4081,7571,212805553879732,6653,211,85343.3843.18
202730,66030,97431,35731,68231,96032,28932,65332,93432,42234,17635,04536,23636,37936,67437,44438,693541,57839,38638,73138,44440,27840,39140,33938,52736,87335,69835,12836,23936,93738,76039,05739,25038,70938,49341,23641,13641,93242,81741,27440,85039,95738,65638,50338,51436,98437,29336,89038,30038,09736,03833,50933,60033,94235,22036,46038,79441,39643,49042,20744,06543,61844,61244,47645,63445,46243,9741,930,17643,52841,86640,09639,21738,14736,63134,62933,22333,58632,76831,18630,77930,85330,77631,50632,20723,67822,47221,17718,87216,23813,71612,40611,0849,6288,0466,6845,3914,2253,2922,4391,8011,272848543874745,6843,217,43843.5443.30
202830,57630,89431,28631,62731,92832,17332,46932,81233,08532,56834,32435,19636,38436,54436,84137,609536,31638,85139,54239,08339,78841,94840,92439,93837,86136,27835,25134,81236,01136,78238,64538,98739,22838,75738,57141,31541,21742,00842,92241,36540,90339,99438,69238,57038,58037,03037,35036,96138,37238,16336,09733,58033,67534,02535,31136,53638,87041,47343,55642,26844,10143,64644,58844,43345,55245,3181,927,72843,80843,29041,56439,73038,78837,66436,08934,05132,60032,87631,98730,35929,87829,83329,64230,20830,72422,46221,16119,77717,46814,87512,41911,0869,7538,3326,8385,5624,3833,3482,5381,8261,306891572864758,5523,222,59643.6843.43
202930,52530,80931,20531,55631,87432,14232,35332,62832,96433,23132,71334,47335,34336,54836,70937,006532,07937,76839,00839,89840,42241,46342,49040,49839,23637,24735,82434,94034,59435,86236,67238,57538,96739,27738,83338,65041,39641,29042,11643,01641,41840,94140,03038,75838,63638,62437,08937,41837,03438,44338,22836,16633,65633,75734,11835,38536,61138,94641,54943,61442,31444,12843,63044,54644,36245,4151,922,85845,14843,57642,97941,18639,30238,30337,11435,49033,41931,91832,10231,14929,47828,90328,74628,43428,82929,16221,16419,77618,31816,01413,47911,1099,7648,4467,0885,6974,5293,4782,5861,9031,326916602877772,3103,227,24743.8343.58
203030,50130,75831,11831,47431,80232,08732,32132,51232,78033,11133,37532,86034,62035,50636,71536,874528,41437,16537,92539,36741,25342,10741,99242,04739,76938,59236,78035,50834,72734,45435,75936,61038,55639,01839,35538,90938,72941,46841,39642,21243,07141,45640,97940,09838,82738,68338,68237,16037,48937,10738,51338,30236,24233,73933,84834,19235,45836,68739,02341,61643,65242,35144,10943,59444,47644,2391,917,29145,25344,91343,27242,59640,74938,82037,75036,50734,83832,72931,17231,26830,25628,52427,86227,58827,15027,37527,49519,79218,33116,80414,52112,0689,7948,4657,1925,9124,6453,6002,6911,9431,384932619904785,7143,231,41943.9743.72
203130,49530,73531,06731,38731,72032,01532,26732,48032,66332,92833,25633,52233,00334,78235,67336,880524,87337,03237,32138,28440,73842,95942,64741,53041,28839,10338,10436,45535,29134,58934,35735,70236,59438,60639,09639,43438,98838,80241,57241,49042,26943,11141,49541,04840,16638,87438,74538,75237,23037,55937,17638,59438,38336,32433,83033,92234,26535,53236,76439,09141,66843,68242,34344,07243,53244,3541,912,76344,09045,02544,60442,89442,14940,25438,26737,14035,84534,12531,97430,37130,38229,28927,50526,75226,35625,79625,82125,73218,36116,83215,25013,01210,6508,5017,2166,0054,8263,6982,7902,0251,416974631932797,4903,235,12644.1043.87
203230,51930,72831,04431,33431,63131,93232,19532,42632,63032,81033,07233,40233,66433,16334,94635,836521,33237,03837,18937,67639,64542,44543,49842,18840,75940,59638,59837,76436,23235,15334,49734,30335,68636,64438,68239,17439,51339,05638,90641,66541,54742,31243,15141,56441,11840,21338,93638,81838,82537,30237,62837,25938,67938,47036,41633,90433,99334,33735,60636,83239,14541,71143,66842,31844,01143,4201,908,09044,20543,87644,72344,22042,45041,64239,68837,65736,47535,12133,34431,16429,51829,42128,25726,42025,57225,05624,34724,17723,89016,87215,29013,67611,4929,2527,2566,0324,9083,8472,8702,1021,477999661959808,9163,238,33844.2344.03
203330,56030,75331,03631,31131,58031,84432,11132,35432,57632,77432,95433,21933,54633,82233,32435,108518,87235,99437,19537,54439,01241,33042,97843,02141,41140,06040,07438,24737,53136,08935,05834,44534,29035,73536,72038,76039,25439,58439,15639,00041,72041,58842,35543,22441,63441,16640,27539,01038,89238,89837,37437,70837,34538,77238,56936,49133,97534,06334,41035,67136,88639,19441,71043,63742,27043,9001,903,22543,28243,99543,59044,34443,77041,94841,06339,06336,99035,74634,32932,50730,29928,59328,39527,15625,26424,32623,66322,81222,45821,97215,34113,72612,0939,9947,9056,0754,9363,9172,9882,1661,5361,043679996818,9603,241,05744.3644.21
203430,61430,79331,06031,30331,55531,79232,02232,27032,50432,72232,91833,10033,36133,70433,98333,486517,18735,26436,14837,54738,86640,67541,85642,49142,22240,70539,53239,70938,00437,37935,99135,00434,43234,34035,81136,79938,83839,32439,68639,24639,05641,76241,63042,43143,29641,68341,22940,34939,08638,96638,97037,45637,79337,44238,87838,64836,56034,04934,13434,47535,72436,93439,19941,69443,58242,1731,897,06843,76243,08143,71243,23043,89843,26041,37540,42238,38236,26134,94933,47731,61429,36227,60627,30125,98324,04422,99022,18621,20620,66819,99813,78712,15010,5308,5496,6254,9793,9443,0472,2581,5861,0867091,031829,0483,243,30344.4844.39
203530,68730,84931,10231,32631,54631,76831,97032,18032,42232,65132,86633,06433,24233,51933,86534,145517,20233,64135,41836,50038,86840,52041,20341,38241,68641,50040,17239,16439,45837,84837,27335,93434,99134,48134,41435,88636,87838,91039,42739,77539,29839,09941,80341,70442,50843,34641,74941,30440,42339,16139,04039,05237,54337,88737,55038,96438,72536,63234,12234,19934,53035,77236,94439,19241,65543,4781,891,00942,05343,56342,81143,35642,80443,39242,67640,73939,72637,63635,46334,09132,56730,64528,36126,55226,13324,74222,73521,57220,64019,53218,82417,98912,21810,5939,0197,1745,4363,9853,0722,3051,6551,1237411,072836,9953,245,20644.5944.59
203630,78930,92131,15731,37031,57231,75931,94732,12932,33032,56832,79833,01233,20733,40033,68034,027516,66634,30233,79635,76837,81840,52241,05040,75040,60040,96040,95439,80238,91239,29737,73937,21235,92235,04134,55634,49035,96336,94939,01239,51939,83139,33839,14241,87841,78042,56243,41241,82641,38240,50039,23439,12439,13837,63837,99237,63839,04738,80536,70334,18934,25034,57835,78036,94039,16041,5681,884,36943,35141,87043,29342,46842,93542,32142,81542,02840,04438,96236,81834,60133,17631,58229,60827,29225,42824,90123,41221,34720,08619,02817,80616,94915,95910,6659,0857,5785,8944,3573,1102,3281,6921,1747671,118845,8483,246,88344.6944.80
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204031,28931,44131,62031,74331,85031,96032,06432,16632,27432,39532,54832,71632,91033,15833,40433,634517,17233,84234,03034,49635,93637,61137,50438,78238,81039,18938,67038,42938,73839,60640,02839,19838,55039,15137,79237,40136,20235,34034,86634,81636,27037,23739,24439,73240,05939,57439,41842,15442,06942,88643,73442,16041,72240,85739,62639,52139,51838,01238,33637,99039,36339,06636,87534,31034,29034,5141,877,52435,61036,62538,62340,74842,18840,48241,55040,47640,62239,73039,85538,77136,58035,19832,87230,47828,77226,92524,73422,26820,18219,14217,35815,19013,63312,23310,7769,5868,3675,1413,9863,0002,0861,3658531,304857,3093,252,00545.0445.45
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204231,35231,58231,84132,02632,14132,20832,24632,30032,37632,46532,56532,68732,83633,01533,22833,479518,34733,71933,94234,34035,62237,31538,03537,77436,44537,43037,64238,32238,07138,02238,46039,42139,94239,23438,68439,31537,95437,55236,36835,51835,00234,90736,35037,35639,39339,86140,18239,72239,58642,32242,23843,06543,92542,36641,94641,06939,81439,70739,69838,18938,48638,12739,44539,08036,85134,2421,882,05634,15734,31435,28836,16538,00539,96341,23039,41640,31139,11839,07638,03137,96436,72134,41132,87230,44827,96826,10724,09721,80319,29817,14215,89914,04411,92510,3628,9607,5696,4295,3333,1022,2641,5941,0311,422853,8393,254,24245.1945.67
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Metadata

Teitl
Amcanestyniadau poblogaeth cenedlaethol sail 2018 ar gyfer Cymru, 2018-2043

Diweddariad diwethaf
Medi 2020 Medi 2020

Diweddariad nesaf
Does dim diweddariad yn y dyfodol, bydd hyn yn cael ei disodli gan amcanestyniad newydd.

Sefydliad cyhoeddi
Llywodraeth Cymru

Ffynhonnell 1
Amcanestyniadau poblogaeth cenedlaethol ar gyfer Cymru ar sail 2018, y Swyddfa Ystadegau Gwladol

Cyswllt ebost
ystadegau.poblogaeth@llyw.cymru

Dynodiad
Ystadegau Gwladol

Cwmpas daearyddol
Cymru

Cwmpas ieithyddol
Saesneg a Chymraeg

Trwyddedu data
Gallwch ddefnyddio ac ailddefnyddio'r data hwn am ddim mewn unrhyw fformat neu gyfrwng, dan delerau'r Drwydded Llywodraeth Agored - gweler http://www.nationalarchives.gov.uk/doc/open-government-licence-cymraeg

Disgrifiad cyffredinol
Mae’r Swyddfa Ystadegau Gwladol yn cynhyrchu amcanestyniadau poblogaeth cenedlaethol ar gyfer Cymru a gwledydd eraill y DU (Dyddiad y datganiad: 11 Mehefin 2020). Mae’r set ddata hon yn rhoi’r data ar gyfer Cymru o’r ffynhonnell honno yn ôl rhyw, blwyddyn sengl oedran a phob blwyddyn o’r flwyddyn sail sef 2018, trwy gyfnod yr amcanestyniad i 2043.

Nodwch fod yr amcanestyniadau'n mynd yn fwyfwy ansicr po bellaf yr ydym yn ceisio edrych i'r dyfodol.

Nodwch hefyd fod y ffigurau hyn yn wahanol i’r data ar gyfer Cymru yn amcanestyniadau poblogaeth awdurdodau lleol oherwydd mai prif nod amcanestyniadau poblogaeth awdurdodau lleol yw cynhyrchu amcanestyniadau poblogaeth awdurdodau lleol cadarn ar gyfer Cymru, sy’n adlewyrchu tueddiadau lleol yn y blynyddoedd diwethaf, ond mai prif ddiben yr amcanestyniadau cenedlaethol yw cynhyrchu amcanestyniadau poblogaeth cadarn ar gyfer Cymru sy’n adlewyrchu tueddiadau cenedlaethol yn y blynyddoedd diwethaf.

Mae’r amcanestyniadau cenedlaethol ac amcanestyniadau awdurdodau lleol yn wahanol am ddau brif reswm:

1. Mae’r fethodoleg a ddefnyddir i gynhyrchu tybiaethau yn amcanestyniadau awdurdodau lleol yn wahanol i’r rheiny a ddefnyddir yn yr amcanestyniadau cenedlaethol. Mae rhai o’r rhain oherwydd ffynonellau data ychydig yn wahanol.

Hefyd, er bod un set o dybiaethau o bosibl yn addas iawn ar gyfer tuedd genedlaethol, efallai na fydd defnyddio tybiaethau tebyg yn cynhyrchu canlyniadau dichonol bob amser ar gyfer yr holl ardaloedd awdurdodau lleol oherwydd y gwahanol natur a thueddiadau rhwng awdurdodau lleol.

2. Mae’r lefel ddaearyddol mae’r tybiaethau’n cael eu seilio a’u cymhwyso arni hefyd yn bwysig. Er enghraifft, nid yw’n briodol symio cyfraddau lleol (e.e. ffrwythlondeb) er mwyn cael cyfradd genedlaethol, ac felly bydd model sy’n gweithredu ar lefelau daearyddol gwahanol (ond yn defnyddio cyfraddau) yn cynhyrchu canlyniadau gwahanol ar gyfer y lefelau daearyddol gwahanol.


Talgrynnu wedi'u ddefnyddio
Mae'r data wedi'u talgrynnu'n annibynnol i'r rhif cyfan agosaf ac mae'n bosibl na fyddant yn adio'n union. Mae oedrannau cymedrig a chanolrifol wedi'u talgrynnu i 2 le degol ac nid ydynt yn adiol.

Gwybodaeth am ddiwygiadau
Disodlodd y data hyn amcanestyniadau poblogaeth cenedlaethol 2016 ar gyfer Cymru fel yr amcangyfrifon ffurfiol o dwf y boblogaeth.
Ddydd Llun 18 Mai 2020, cyhoeddodd yr ONS nodyn ar eu gwefan i roi gwybod i ddefnyddwyr eu bod wedi darganfod gwall a oedd yn effeithio ar yr amcanestyniadau poblogaeth cenedlaethol sy’n seiliedig ar 2018. Roedd y gwall wedi ei achosi gan brosesu mudo rhwng Cymru a Lloegr yn anghywir, gan arwain at amcanestyniad poblogaeth canol-2028 oddeutu 65,000 yn rhy isel yng Nghymru, ac amcanestyniad poblogaeth 65,000 yn rhy uchel yn Lloegr.
Cyhoeddodd yr ONS amcanestyniadau wedi eu cywiro ar gyfer Cymru ddydd Iau 11 Mehefin.

Ansawdd ystadegol
Gweler y dolenni i'r we.

Allweddeiriau
Amcanestyniadau poblogaeth; twf poblogaeth; mudo; mudiad; newid naturiol; genedigaethau; marwolaethau