Renewal area expenditure has steadily decreased in the past 10 years, from £33.6 million in 2012-13 to £310,000 in 2021-22.
Mae cost casglu ardrethi wedi cynyddu'n raddol dros y degawd diwethaf, o £6.3 miliwn yn 2011-12 i £7 miliwn yn 2021-22.