Of the population aged three years or older who are able to speak Welsh, there has been a slight increase in the percentage of those born outside Wales, which rose from 11.8% in 2011 to 12.1% in 2021.
O blith y boblogaeth tair oed neu'n hŷn sy'n gallu siarad Cymraeg, bu rhywfaint o gynnydd yn y ganran a anwyd y tu allan i Gymru, o 11.8% yn 2011 i 12.1% yn 2021.