The intention was for the survey results to be available for publication by April 2021 and surveys to be carried out at least bi annually thereafter.
Y bwriad oedd i ganlyniadau'r arolwg fod ar gael i'w cyhoeddi erbyn mis Ebrill 2021 a chynnal arolygon o leiaf ddwywaith y flwyddyn wedi hynny.