This means that these local authorities experienced the least change in population between mid-2012 and mid-2021 that could not be accounted for by any changes to births, deaths, or migration.
Gostyngodd canran y bobl tair oed neu’n hŷn sy’n gallu siarad Cymraeg rhwng 2011 a 2021 ym mhob awdurdod lleol ac eithrio yng Nghaerdydd, Bro Morgannwg, Rhondda Cynon Taf a Merthyr Tudful.