The national indicator on the percentage of households spending 30% or more of income on housing costs is based on data from the DWP Family Resources Survey.
Mae’r dangosydd cenedlaethol ar ganran yr aelwydydd sy’n gwario 30% neu fwy o’u hincwm ar gostau tai yn seiliedig ar ddata o Arolwg Adnoddau Teulu yr Adran Gwaith a Phensiynau.