The value for April to June 2021 will have already been subject to some of this downward revision, whereas the equivalent figure for April to June 2022 will not yet.
Bydd gwerth Ebrill 2021 i Fawrth 2022 eisoes wedi bod yn destun rhywfaint o ddiwygio am i lawr, ond nid yw’r ffigur cyfatebol ar gyfer Ebrill 2022 i Fawrth 2023 wedi cael ei ddywygio eto.