Since the economic downturn and the introduction of austerity measures there has been an increasing number of schools with negative or lower level of reserves.
Ers y dirywiad economaidd a'r mesurau cyni a gafodd eu cyflwyno yn sgil hynny, roedd gan nifer cynyddol o ysgolion gronfeydd wrth gefn negyddol neu lefel is o gronfeydd wrth gefn.