New information is shown for the quarter that ended on 31 March 2022 and data for October to December 2021 has been revised.
Dangosir gwybodaeth newydd ar gyfer y chwarter a ddaeth i ben ar 31 Mawrth 2022 ac mae data ar gyfer mis Hydref i fis Rhagfyr 2021 wedi'i ddiwygio.