With businesses closed from 23 October for 17 days during the firebreak, many businesses then closed for the year with no data available for November and December 2020.
Fodd bynnag, roedd ysgolion ar gau rhwng Rhagfyr 2020 a Mawrth 2021 oherwydd pandemig y coronafeirws (COVID-19) ac felly gohiriwyd dyddiad y cyfrifiad i 20 Ebrill 2021.