The number of those studying at least 5, has also decreased whilst those studying 40 credits has remained stable and those studying 80 and 120 credits has increased.
Mae nifer y rhai sy’n astudio o leiaf 5 credyd hefyd wedi gostwng, tra bo’r nifer sy’n astudio 40 credyd wedi aros yn sefydlog, a’r nifer sy’n astudio 80 a 120 credyd wedi cynyddu.