Whilst earnings data are published at SIC division level, figures reported here are based on SIC sections, the level above, for increased accuracy where possible.
Er bod data enillion yn cael eu cyhoeddi ar lefel is-adrannau SIC, mae’r ffigurau a nodir yma yn seiliedig ar adrannau SIC, y lefel uwch, er mwyn sicrhau mwy o gywirdeb lle bo hynny’n bosibl.