The exception to this are the hotel and guesthouse/B&B sectors where due to a methodological change in 2020 and 2021, comparisons with 2019 cannot be made.
Yr eithriad i hyn yw'r sectorau gwestai a thai llety/gwely a brecwast lle na ellir cymharu â 2019 oherwydd newid methodolegol yn 2020 a 2021.