When interpreting this chart, it is important to be aware that some authorities have lower levels of higher rates transactions (those authorities with the lowest percentages in Figure 8.4).
Wrth ddehongli'r siart hon, mae'n bwysig bod gan rai awdurdodau lefelau is o drafodiadau cyfraddau uwch (yr awdurdodau hynny sydd â'r canrannau isaf yn Ffigur 8.4).