Most of the small areas which saw the largest increases were in south east Wales and most small areas which saw the largest decreases were in south west Wales.
Roedd y rhan fwyaf o’r ardaloedd bach a welodd y cynnydd mwyaf yn ne ddwyrain Cymru ac roedd y rhan fwyaf o’r ardaloedd bach a welodd y gostyngiadau mwyaf yn ne orllewin Cymru.