a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    2016
f    Excluding water and waste management.
g    2014
h    Data refers to a 5-year period preceding the reference year.
i    2015
j    Data as at the end of December.
k    Users in the last 3 months.
l    Population aged 16 to 74 years.
m    Provisional data.
n    2004
o    Development Assistance Committee member (OECD).
p    2002