Data for gross disposable household income (GDHI) is currently available only up until 2021, so this section focuses on longer run trends.
Dim ond hyd at 2021 y mae data ar gyfer incwm gwario gros aelwydydd (GDHI) ar gael ar hyn o bryd, felly mae’r adran hon yn canolbwyntio ar dueddiadau hirdymor.