According to Census 2021, 17.8% of people aged three years or older in Wales reported they could speak Welsh, down from 19.0% in Census 2011.
Yn ôl Cyfrifiad 2021, dywedodd 17.8% o bobl tair oed neu hŷn yng Nghymru eu bod yn gallu siarad Cymraeg, i lawr o 19.0% yng Nghyfrifiad 2011.