[Note 1] We have made statistical corrections to the data in this chart to exclude certain taxpayer amendments, where the validity of those amendments is being investigated.
[Nodyn 1] Rydym wedi gwneud cywiriadau ystadegol i’r data yn y siart hwn i eithrio rhai newidiadau gan drethdalwyr, lle mae dilysrwydd y newidiadau hynny’n cael ei ymchwilio.