Footnotes  
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    2014
i    Data refers to a 5-year period preceding the reference year.
j    Data as at the end of December.
k    Users in the last 12 months.
l    Population aged 16 to 74 years.
m    Provisional data.
n    2004