Taking that into account, the 7 day rolling average has decreased over the last week, with levels now at the lowest since the beginning of the reporting period.
O ystyried hynny, mae'r cyfartaledd treigl 7 diwrnod wedi gostyngiad yn yr wythnos ddiwethaf, gyda lefelau nawr yr isaf ers dechrau’r cyfnod adrodd.