For the latest year compared with a year earlier, most authorities have seen little change in their percentage of residential transactions which were at the higher rates, with several exceptions.
Ar gyfer y flwyddyn diweddaraf, nid yw'r rhan fwyaf o awdurdodau wedi gweld gostyngiadau yn eu canran o drafodiadau preswyl a oedd ar y cyfraddau uwch, gyda nifer o eithriadau.