All Welsh speakers are included in this analysis, from those who considered themselves to be fluent to those who noted that they could say just a few words.
Mae pob siaradwr Cymraeg yn cael eu cynnwys yn y dadansoddiad hwn, o’r rhai a oedd yn ystyried eu hunain yn rhugl, i’r rhai a nododd y gallent ddweud ychydig eiriau'n unig.