In Wales, there were responses to the question on gender identity from 2.4 million people (93.7% of the population aged 16 years and over).
Yng Nghymru, cafwyd ymatebion i'r cwestiwn ar hunaniaeth o ran rhywedd gan 2.4 miliwn o bobl (93.7% o'r boblogaeth 16 oed a throsodd).