The two charts 7a and 7b show how the time taken to receive higher rates refunds has changed over time and the proportion of all refunds that are paid within 30 days.
Mae'r ddau siart 7a a 7b yn dangos sut mae'r amser a gymerir i dderbyn ad-daliadau cyfraddau uwch wedi newid dros amser a chyfran yr holl ad-daliadau a delir o fewn 30 diwrnod.