The percentage of children and young people aged 3 to 15 years reported as being able to speak Welsh decreased between 2011 and 2021 in all local authorities.
Gostyngodd y ganran o blant a phobl ifanc 3 i 15 oed y nodwyd eu bod yn gallu siarad Cymraeg rhwng 2011 a 2021 ym mhob awdurdod lleol.