On Anglesey, small areas near Llangefni and Amlwch had the greatest decreases (falling 7.9 percentage points and 6.3 percentage points respectively).
Ar Ynys Môn, ardaloedd bychain ger Llangefni ac Amlwch oedd â’r gostyngiadau mwyaf (gostyngiad o 7.9 pwynt canran a 6.3 pwynt canran yn y drefn honno).