a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    Calculated by the UN Statistics Division from national indices.
f    2016
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    Data refer to offences, not victims, of intentional homicide.
l    Population aged 16 to 74 years.
m    Users in the last 3 months.
n    Provisional data.
o    2004
p    Border statistics are not collected any more, surveys used instead.
q    Development Assistance Committee member (OECD).