a    Projected estimate (medium fertility variant).
b    2015
c    2017
d    2016
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Data refers to a 5-year period preceding the reference year.
h    Data as at the end of December.
i    2013
j    Population aged 16 to 74 years.
k    Users in the last 3 months.
l    2009
m    2004
n    2014
o    Development Assistance Committee member (OECD).
p    Provisional data.