The graded and non-graded samples are spread across the different regions and sectors except restaurants, pubs or cafes, where grading is not applicable.
Mae'r samplau sydd wedi eu graddio a'r samplau heb eu graddio wedi eu gwasgaru ar draws y gwahanol ranbarthau a sectorau ar wahân i fwytai, tafarndai a caffis, nad ydynt yn cael eu graddio.