In Ceredigion, the largest decreases were 8.5 percentage points in a small area near Cardigan, 8.2 percentage points around Tregaron and 7.5 percentage points around Llanddewi Brefi.
Yng Ngheredigion bu’r gostyngiadau mwyaf o 8.5 pwynt canran mewn ardal fach ger Aberteifi, 8.2 pwynt canran o amgylch Tregaron a 7.5 pwynt canran o amgylch Llanddewi Brefi.