a    Including Crimea.
b    2017
c    Excludes the temporarily occupied territory of the Autonomous Republic of Crimea and Sevastopol.
d    2018
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    2016
h    Data classified according to ISIC Rev. 3.
i    2012
j    Data refers to a 5-year period preceding the reference year.
k    2015
l    Data as at the end of December.
m    2014
n    2009
o    Users in the last month.
p    Population aged 15 to 59 years.
q    Break in the time series.
r    Excluding data from some regions, provinces or states.
s    2004