a    Projected estimate (medium fertility variant).
b    2015.
c    2016.
d    Data classified according to ISIC Rev. 4.
e    Estimate.
f    2014.
g    Excluding water and waste management.
h    Data refers to a 5-year period preceding the reference year.
i    Data as at the end of December.
j    Users in the last 6 months.
k    Population aged 14 years and over.
l    2004.
m    2008.
n    2012.
o    Including Liechtenstein.
p    Including health establishments.
q    Development Assistance Committee member (OECD)
r    Provisional data.