Although not all of the data sources used are from official statistics, the report itself has been developed and published in accordance with the Code of Practice for Statistics.
Er nad yw holl ffynonellau’r data a ddefnyddir yn dod o ystadegau swyddogol, mae’r adroddiad ei hun wedi’i ddatblygu a’i gyhoeddi’n unol â’r Cod Ymarfer ar gyfer Ystadegau.