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c ) notes that since labour came to power in 1997 the average band d council tax bill in wales has risen from £416 to £837 , an increase of £421 or 101 per cent
c ) yn nodi bod cyfartaledd biliau'r dreth gyngor ar gyfer band d yng nghymru wedi codi o £416 i £837 ers i'r blaid lafur ddod i rym ym 1997 , sef cynnydd o £421 neu 101 y cant