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|  Principal projection | Lower variant | Higher variant | Zero migration variant | Ten year average migration variant |
| 2011 | 30,655 | 30,655 | 30,655 | 30,655 | 30,655 |
| 2012 | 30,752 | 30,752 | 30,752 | 30,722 | 30,803 |
| 2013 | 30,844 | 30,835 | 30,848 | 30,785 | 30,945 |
| 2014 | 30,943 | 30,919 | 30,955 | 30,855 | 31,094 |
| 2015 | 31,024 | 30,980 | 31,046 | 30,903 | 31,225 |
| 2016 | 31,107 | 31,042 | 31,140 | 30,954 | 31,358 |
| 2017 | 31,174 | 31,087 | 31,220 | 30,991 | 31,474 |
| 2018 | 31,243 | 31,134 | 31,304 | 31,040 | 31,595 |
| 2019 | 31,314 | 31,181 | 31,390 | 31,091 | 31,716 |
| 2020 | 31,370 | 31,213 | 31,462 | 31,127 | 31,823 |
| 2021 | 31,419 | 31,239 | 31,530 | 31,157 | 31,924 |
| 2022 | 31,468 | 31,264 | 31,600 | 31,189 | 32,024 |
| 2023 | 31,502 | 31,271 | 31,656 | 31,211 | 32,109 |
| 2024 | 31,527 | 31,269 | 31,708 | 31,229 | 32,187 |
| 2025 | 31,539 | 31,252 | 31,749 | 31,239 | 32,252 |
| 2026 | 31,541 | 31,222 | 31,783 | 31,240 | 32,307 |
| 2027 | 31,536 | 31,184 | 31,815 | 31,235 | 32,356 |
| 2028 | 31,527 | 31,139 | 31,845 | 31,221 | 32,401 |
| 2029 | 31,521 | 31,092 | 31,880 | 31,208 | 32,449 |
| 2030 | 31,500 | 31,027 | 31,905 | 31,181 | 32,484 |
| 2031 | 31,477 | 30,956 | 31,930 | 31,152 | 32,516 |
| 2032 | 31,447 | 30,872 | 31,954 | 31,118 | 32,541 |
| 2033 | 31,411 | 30,776 | 31,974 | 31,087 | 32,560 |
| 2034 | 31,371 | 30,671 | 31,996 | 31,056 | 32,576 |
| 2035 | 31,322 | 30,554 | 32,012 | 31,015 | 32,582 |
| 2036 | 31,269 | 30,428 | 32,028 | 30,973 | 32,584 |
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Amcanestyniadau aelwydydd a\r gyfer awdurdod lleol a ddewiswyd yn ôl blwyddyn a amrywiad
