Additional data linked to Welsh language transmission were collected in 2018-19 on where and when Welsh speakers started to learn the language.
Yn 2018-19 casglwyd data ychwanegol sy’n gysylltiedig â throsglwyddo’r Gymraeg ynghylch ble a phryd y dechreuodd siaradwyr Cymraeg ddysgu’r iaith.