In July to September 2022 and October to December 2022, these figures were 11%, the highest quarterly percentages seen to date.
Yn Ngorffennaf i Fedi 2022 ac yn Hydref i Ragfyr 2022, roedd y ffigurau hyn wedi codi i 11%, sef y ganranau chwarterol uchaf a welwyd hyd yma.