The numbers and percentage of females aged three years or older who are able to speak Welsh fell from 300,300 (19.9%) in 2011 to 288,540 (18.7%) in 2021.
Bu gostyngiad yn niferoedd a chanran y merched tair oed neu'n hŷn sy'n gallu siarad Cymraeg o 300,300 (19.9%) yn 2011 i 288,540 (18.7%) yn 2021.