The revisions between provisional and final 2020 estimates were larger than those generally seen when provisional estimates are updated with final data.
Roedd y diwygiadau rhwng amcangyfrifon dros dro a therfynol 2020 yn fwy na’r rhai a welir gan amlaf pan fo amcangyfrifon dros dro’n cael eu diweddaru â’r data terfynol.