Data is for pupils in primary, middle, secondary and special schools only and does not include data for nursery schools or pupil referral units.
Mae'r data ar gyfer disgyblion mewn ysgolion cynradd, canol, uwchradd ac arbennig yn unig ac nid yw'n cynnwys data ar gyfer ysgolion meithrin nac unedau cyfeirio disgyblion.