For April 2020 to March 2021, the ordering and distribution of local authorities in this chart is similar to April 2019 to March 2020 (data extracted in June 2020).
Ar gyfer Ebrill 2020 i Fawrth 2021, mae trefn a dosbarthiad yr awdurdodau lleol yn y siart hon yn debyg i Ebrill 2019 i Fawrth 2020 (data extracted in June 2020).