This was a decrease of approximately 24,000 people since the 2011 Census (or a decrease of 1.2 percentage points), when 562,000 people were able to speak Welsh (or 19.0% of the population).
Roedd hyn yn ostyngiad o oddeutu 24,000 o bobl ers Cyfrifiad 2011 (neu ostyngiad o 1.2 pwynt canran), pan oedd yna 562,000 o bobl yn gallu siarad Cymraeg (neu 19.0% o’r boblogaeth).