Up to July to September 2023, the figure varied between 80% and 90%, but from October to December 2023, it has remained above 90%.
Hyd at Gorffennaf i Fedi 2023, mae'r ffigur wedi amrywio rhwng 80% a 90%, ond o Hydref i Ragfyr 2023, mae wedi aros dros 90%.