* With the move to a system of recording New HR details during 2023-2024, there has been a slight decline in the level of data we have about Welsh language skills.
Cyhoeddodd SYG amcangyfrifon wedi eu hail-bwysoli LFS ar gyfer Cymru ym mis Rhagfyr 2024 ar gyfer y cyfnod o fis Ionawr i fis Mawrth 2019, a arweiniodd at newid sylweddol yn y data.