Small areas around Cwmaman and Llanybydder had the largest decreases, ranging from 11.8 to 10.8 percentage points.
Ardaloedd bychain o gwmpas Cwmaman a Llanybydder oedd â’r gostyngiadau mwyaf gyda gostyngiadau yn amrywio o 11.8 i 10.8 pwynt canran.