The number of Welsh speakers recorded in the 2001, 2011 and 2021 Census are plotted on the same chart, labelled 582,400, 562,000 and 538,300 respectively.
Mae nifer y siaradwyr Cymraeg a gofnodwyd yng Nghyfrifiad 2001, 2011 a 2021 wedi'u plotio ar yr un siart, ac wedi'u labelu, sef 582,400, 562,000 a 538,300 yn y drefn honno.