The intention was for the survey results to be available for publication by April 2021 and surveys then to be carried out at least every two years.
Y bwriad oedd y byddai canlyniadau’r arolwg ar gael i’w cyhoeddi erbyn mis Ebrill 2021 ac yna y câi arolygon eu cynnal bob dwy flynedd, o leiaf.