When revisions are made as much consistent back data as practicable will be provided, subject to avoiding any further delay in the release of final statistics.
Pan wneir diwygiadau, darperir cymaint o ôl-ddata cyson ag sy’n ymarferol bosibl, ar yr amod yr osgoir unrhyw oedi pellach cyn rhyddhau’r ystadegau terfynol.