Caiff busnesau sy'n gwerthu nwyddau'n uniongyrchol i'r cwsmeriaid sy'n eu defnyddio eu diffinio fel manwerthwyr. Yr ystadegyn allweddol ar gyfer manwerthu yw'r Mynegai Gwerthiannau Manwerthu (RSI), a gyhoeddir yn fisol. Mae data yn y RSI yn ymdrin â gwariant ar nwyddau yn unig (mewn siopau ac ar-lein). Mae data am wario ar wasanaethau ar gael ym Mynegai Gwasanaethau (IoS).
In December 2020, retail sales volumes increased by 0.3% when compared with November 2020, resulting in an increase of 2.7% when compared with February's pre-lockdown level.
Clothing stores reported strong monthly growth of 21.5%, rebounding from a large fall in November 2020 when stores were closed because of coronavirus (COVID-19) restrictions.
The year-on-year growth rate in the volume of retail sales increased by 2.9% when compared with December 2019; non-store retailers reported the largest year-on-year growth at 43.5% while food stores also saw strong annual growth of 4.4%.