The main reason for this change in January to March 2023 was a similarly size percentage decrease in the weight of standard rate disposals, as described under Figure 1a.
Y prif reswm dros y newid hwn yn Ionawr i Fawrth 2023 oedd gostyngiad canrannol o faint tebyg ym mhwysau gwarediadau cyfradd safonol, fel y disgrifir yn Ffigur 1a.