The census results and APS results for 2001, 2011 and 2021 have been included on the chart above to show the differences between the two sources at the same time periods.
Mae canlyniadau’r cyfrifiad ar gyfer 2001, 2011 a 2021 wedi’u cynnwys ar y siart uchod, er mwyn dangos y gwahaniaethau rhwng y cyfrifiad a’r Arolwg Blynyddol yn yr un cyfnod.