Of those Welsh domiciled respondents who left Wales to study, 43% returned to work in Wales, whereas 57% did not return.
Cyfradd ymateb yr arolwg oedd 47%; o’r holl siaradwyr Cymraeg a gafodd eu nodi drwy Arolwg Cenedlaethol Cymru, roedd 47% o’r rheini wedi cwblhau a dychwelyd yr holiadur.