Description of Figure 9: Line chart showing that for Gwynedd, the population aged 18 to 21 years old has increased due to revisions to net internal migration.
Disgrifiad o Ffigur 9: Siart linell sy'n dangos, ar gyfer Gwynedd, fod y boblogaeth 18 i 21 oed wedi cynyddu o ganlyniad i ddiwygiadau i fudo mewnol net.