This can be attributed in part to the general spread of dwellings across council tax bands in Wales, with almost three-quarters of all chargeable dwellings in Wales being in Bands A to D.
Gellir priodoli hyn yn rhannol i ddosbarthiad cyffredinol anheddau ar draws bandiau'r dreth gyngor yng Nghymru, gyda bron i dri chwarter yr holl anheddau trethadwy yng Nghymru ym mandiau A i D.