The number of people reporting to be able to speak Welsh declined from December 2018 to March 2020, before increasing again in the most recent two quarters.
Gostyngodd nifer y bobl sy'n adrodd eu bod yn gallu siarad Cymraeg rhwng mis Rhagfyr 2018 a mis Mawrth 2020, cyn cynyddu eto ers hynny.