The figures show GB overnight visitors spent a total of nearly £2 billion in Wales in 2015, an increase of almost 14% on the previous year.
Dengys y ffigurau bod ymwelwyr dros nos o Brydain Fawr wedi gwario bron i £2 biliwn yng Nghymru yn 2015, cynnydd o bron i 14% ar y flwyddyn flaenorol.