As the ESR is a live system and data extracts are taken from it, data presented may be revised in future editions of the statistical release.
Gan fod y Cofnod Staff Electronig yn system fyw a bod rhannau o ddata'n cael eu cymryd ohono, gellir diwygio’r data a gyflwynir mewn rhifynnau o'r datganiad ystadegol yn y dyfodol.