Over the summer months attendances increased and approached pre-COVID-19 levels in August, before falling in September and falling further through to November.
Dros fisoedd yr haf roedd nifer yr ymweliadau wedi cynyddu ac erbyn mis Awst roeddent bron wedi cyrraedd lefelau cyn COVID-19, cyn disgyn ym mis Medi a disgyn ymhellach ym mis Hydref.