There were small increases in the percentage of people able to speak Welsh in the younger adult age groups (those aged 16 to 19 years old and those aged 20 to 44).
Bu cynnydd bach yn y ganran o bobl sy'n gallu siarad Cymraeg yn y grwpiau oedolion iau (y rhai 16 i 19 oed a'r rhai 20 i 44 oed).