As might be expected the low average time to process refunds leads to lower variation in this measure over the past 2 years, with only isolated peaks.
Fel y gellid disgwyl, mae'r amser cyfartalog isel a gymerir i brosesu ad-daliadau yn arwain at amrywiad is yn y mesur hwn dros y 2 flynedd ddiwethaf, gyda dim ond ambell i frig.