As with question 31, not all of the 20 respondents answered for every single output, so there are differences in the number of respondents per output, with the lowest being 16.
Fel gyda chwestiwn 31, ni wnaeth pob un o’r 20 o ymatebwyr ateb ar gyfer pob allbwn, felly ceir gwahaniaethau yn nifer yr ymatebwyr fesul allbwn.