Since October to December 2021 the guidance changed to ask about respondents ‘usual’ working patterns, therefore data from 2022 onwards will reflect actual commuting patterns.
Ers cyfnod mis Hydref i fis Rhagfyr 2021, newidiodd y canllawiau i ofyn am batrymau gwaith 'arferol' ymatebwyr, felly bydd data o 2022 ymlaen yn adlewyrchu gwir batrymau cymudo.