For these authorities, an estimation for this period has been calculated based on the first 3 quarters of 2019-20 (April to December 2019) and quarter 4 from the previous year (January to March 2019).
Data Ebrill 2019 i Fawrth 2020 yn erbyn ein hamcangyfrifon dros dro cyntaf ar gyfer Ebrill 2018 i Fawrth 2019 (a gyhoeddwyd gennym hefyd ym mis Ebrill 2019).