This is consistent over time, but the percentage of children and young people aged 3 to 15 years who can speak Welsh has been decreasing in general since the beginning of 2019.
Mae hyn wedi arwain at wneud diwygiad bach i ganran y boblogaeth 3 oed a throsodd a all siarad Cymraeg yn rhugl ar gyfer 2019-20, ac ambell ddiwygiad i'r data ar gyfer 2013-15.