Data are available for 4 years for both the count of transactions (shown by the line, left hand axis) and tax at risk (shown by the bars, right hand axis).
Mae data 4 flynedd ar gael ar gyfer y risg dreth hon ac ar gyfer nifer y trafodiadau (a ddangosir gan y llinell, echelin chwith) a threth mewn perygl (a ddangosir gan y bariau, echelin dde).