a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    2016
f    2014
g    Data refers to a 5-year period preceding the reference year.
h    2015
i    Data as at the end of December.
j    Population aged 16 to 74 years.
k    Users in the last 3 months.
l    Provisional data.
m    2004
n    Only paid accommodation; excluding stays at friends and relatives and second homes.
o    Development Assistance Committee member (OECD).