Following a small drop below 2019 to 2020 levels in January, record levels were again recorded as the year came to a close.
Yn dilyn gostyngiad bach ym mis Ionawr i fod yn îs na lefelau 2019 hyd 2020, cofnodwyd lefelau uwch nag erioed unwaith eto wrth i'r flwyddyn ddod i ben.