Residential revenues then increased, with monthly revenues in September to December 2021 being the highest seen to date, except for the June 2021 peak.
Roedd y gwerthordd chwarterol ar gyfer refeniw ychwanegol o dreth breswyl cyfraddau uwch, a threth amhreswyl oedd yr ail uchaf a welwyd hyd yma, ar ôl Ebrill i Fehefin 2021.