Considering age groups where more than 100 births occurred, the largest percentage point increase was seen in the 40 to 44 age group (from 65% to 71%).
Wrth ystyried grwpiau oedran lle cafwyd mwy na 100 o enedigaethau, gwelir y cynnydd mwyaf yn y pwynt canran o fewn y grŵp oedran 40 i 44 oed (o 65% i 71%).