The 50 to 59 age group has the most staff for all staff groups and the under 30 age group has the least staff for all staff groups.
Y grŵp oedran 50 i 59 oed sydd â'r nifer mwyaf o staff ar gyfer pob grŵp staff a'r grŵp oedran dan 30 oed sydd â'r nifer lleiaf o staff ar gyfer pob grŵp staff.