Taking that into account, the 7 day rolling average generally decreased from January 2021 to the beginning of June 2021, and has remained relatively stable since.
O ystyried hynny, mae'r cyfartaledd treigl 7 diwrnod wedi gostwng o Ionawr 2021 i ddechrau Mehefin 2021, ac wedi parhau yn eithaf sefydlog ers hyn.