In Gwynedd, small areas near Bangor, Corris, Blaenau Ffestiniog and Bala saw the largest decreases (between 6 and 7 percentage points).
Yng Ngwynedd, ardaloedd bychain ger Bangor, Corris, Blaenau Ffestiniog a’r Bala (gostyngiadau o rhwng 6 a 7 pwynt canran) a welodd y gostyngiadau mwyaf.