the local authorities whose populations are projected to decrease are Ceredigion (by 3.3%), Wrexham (by 1.5%), Blaenau Gwent (by 0.7%) and the Isle of Anglesey (by 0.4%)
yr awdurdodau lleol yr amcanestynnir y bydd eu poblogaeth yn lleihau ydy Ceredigion (3.3%), Wrecsam (1.5%), Blaenau Gwent (0.7%) ac Ynys Môn (0.4%)