[Note 1] Some comparisons have been calculated using rounded figures, so the actual percentage point difference may vary by up to 1 percentage point.
[Nodyn 1] Rhai o’r cymariaethau wedi’u cyfrifo gan ddefnyddio ffigurau wedi’u talgrynnu, felly mae’n bosibl y ceir amrywiad o hyd at 1 pwynt canran o’r gwahaniaeth pwynt canran gwirioneddol.