Due to the COVID-19 pandemic, temporary closures were in place for the first 3 months of 2021, and therefore figures for the first quarter are not available for this period.
Oherwydd y pandemig COVID-19, roedd cau dros dro ar waith am 3 mis cyntaf 2021, ac felly nid yw'r ffigurau ar gyfer y chwarter cyntaf ar gael ar gyfer y cyfnod hwn.