Taking that into account, the 7 day rolling average generally decreased from January 2021 to the beginning of June 2021, but has been generally increasing over recent weeks.
O ystyried hynny, mae'r cyfartaledd treigl 7 diwrnod wedi gostwng ar y cyfan rhwng Ionawr 2021 a dechrau Mehefin 2021, ond mae wedi bod yn cynyddu yn gyffredinol dros yr wythnosau diwethaf.