This is due to an increase in the number of pupils being recorded as subsidiary enrolment at a maintained school, as opposed to being recorded as main or current enrolment status.
Mae hyn oherwydd cynnydd yn nifer y disgyblion sy'n cael eu cofnodi gyda chofrestriad atodol mewn ysgol a gynhelir, yn hytrach na chael eu cofnodi fel statws cofrestru prif neu gyfredol.