a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    Calculated by the UN Statistics Division from national indices.
f    2016
g    Excluding water and waste management.
h    2014
i    Data refers to a 5-year period preceding the reference year.
j    2015
k    Data as at the end of December.
l    Users in the last 6 months.
m    Population aged 14 years and over.
n    2004
o    2008
p    Including Liechtenstein.
q    Development Assistance Committee member (OECD).