The Higher Education Statistics Agency (HESA) data used in the compilation of the figures has been revised from 2012 to incorporate two main changes:
Mae data'r Asiantaeth Ystadegau Addysg Uwch (HESA) a ddefnyddir wrth lunio'r ffigurau wedi cael ei ddiwygio o 2012 i gynnwys dau brif newidiadau: