(a) Data not available for 2020-21 due to changes to the National survey for Wales as a result of the coronavirus (COVID-19) pandemic.
[Nodyn 1] Nid oes data ar gael ar gyfer 2020-2021 oherwydd newidiadau i Arolwg Cenedlaethol Cymru yn sgil pandemig y coronafeirws (COVID-19).