a    Projected estimate (medium fertility variant).
b    2015.
c    2014.
d    2016.
e    Data classified according to ISIC Rev. 4.
f    Estimate.
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    2013.
k    Data refers to active subscriptions only.
l    Users in the last 3 months.
m    Population aged 16 to 74 years.
n    2004.
o    Development Assistance Committee member (OECD)
p    Provisional data.