Please note data for Neath Port Talbot, Bridgend and Pembrokeshire have been suppressed due to inadequate sample size.
Nodwch fod data ar gyfer Blaenau Gwent, Pen-y-bont ar Ogwr, Ceredigion, Sir y Fflint, Gwynedd, Sir Fynwy a Rhondda Cynon Taf wedi'u hatal oherwydd maint sampl annigonol i ddarparu data o ansawdd.