Some of these centres are still operational and as a result, some data reported in this statistical release for 2020-21 and 2021-22 will be a small undercount of the true activity which occurred.
Fe fydd cau ysgolion rhwng Mawrth ac Awst 2020 ac Ionawr i Fawrth 2021 yn debygol o fod wedi cael effaith ar ystadegau 2019/20 a 2020/21 a gyflwynir yn yr adroddiad hwn.