Not all individuals responded to all questions; where percentages are presented in this report, the total number of responses for each question has been used to calculate the percentage.
Nid oedd pob unigolyn wedi ateb pob cwestiwn; pan gyflwynir canrannau yn yr adroddiad hwn, defnyddiwyd cyfanswm nifer yr ymatebion i bob cwestiwn i gyfrifo’r ganran.