The percentage of LSOAs in which more than 70% of their population aged three years or older were able to speak Welsh also decreased from 3% in 2011 to 2% in 2021.
Gostyngodd canran yr ACEHIau lle roedd mwy na 70% o’u poblogaeth tair oed neu’n hŷn yn gallu siarad Cymraeg hefyd o 3% yn 2011 i 2% yn 2021.