The bar and line chart shows that for data by year the transaction was effective, the number of higher rates refunds claimed has generally declined each year, as would be expected.
Mae'r siart bar a llinell yn dangos, ar y gyfer data fesul chwarter daeth trafodiadau i rym, bod nifer a gwerth yr ad-daliadau cyfraddau uwch a hawliwyd wedi amrywio'n sylweddol.