In Wales the gap narrowed by 0.2 percentage points and in the UK, it has narrowed by 0.2 percentage points compared to the previous year.
Yng Nghymru fe wnaeth y bwlch leihau 0.2 pwynt canran ac yn y DU, mae wedi lleihau 0.2 pwynt canran o'i gymharu â'r flwyddyn flaenorol.