a    Projected estimate (medium fertility variant).
b    2015
c    2017
d    2016
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Calculated by the Statistics Division of the United Nations from national indices.
h    Excluding water and waste management.
i    2014
j    Data refers to a 5-year period preceding the reference year.
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    2012
q    Including Liechtenstein.
r    Development Assistance Committee member (OECD).
s    Provisional data.