Since 2015, all public bodies have been expected to publish this data in pay policy statements, but in most cases this data was found to be in annual reports or statements of accounts instead.
Ar hyn o bryd, mae Llywodraeth Cymru yn ymchwilio i ffynonellau data amgen ond, ar gyfer y datganiad hwn, mae ffigurau tatws 2020 wedi'u defnyddio fel amcangyfrif dros dro.