During 2021-22, cases remained broadly stable apart from a small dip in quarter 3, while the value of the tax at risk went up a little at the start of 2021-22, before dropping back.
Yn ystod 2021-22, arhosodd achosion yn weddol sefydlog ar wahân i ostyngiad bach yn chwarter 3, tra bod gwerth y dreth mewn perygl wedi cynyddu ychydig ar ddechrau 2021-22, cyn gostwng unwaith eto.