Small revisions were made to the Standard Occupational Classification used to map jobs to occupations and industries between 2011 and 2021.
Cafodd diwygiadau bach eu gwneud i'r Dosbarthiad Galwedigaethol Safonol a ddefnyddir i gysylltu swyddi â galwedigaethau a diwydiannau rhwng 2011 a 2021.