Taking that into account, the 7 day rolling average has generally decreased since early January 2021, with levels now at the lowest since the beginning of the reporting period.
O ystyried hynny, mae’r cyfartaledd treigl 7 diwrnod wedi gostwng ers dechrau Ionawr 2021, gyda lefelau nawr yr isaf ers dechrau’r cyfnod adrodd.