[Note 1] Data not available for 2020-2021 due to changes in 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).