a    Including Crimea.
b    Projected estimate (medium fertility variant).
c    2015.
d    2016.
e    Excludes the temporarily occupied territory of the Autonomous Republic of Crimea and Sevastopol.
f    Data classified according to ISIC Rev. 4.
g    Estimate.
h    Series linked to former series.
i    2013.
j    2014.
k    Data classified according to ISIC Rev. 3.
l    2012.
m    Break in the time series.
n    Data refers to a 5-year period preceding the reference year.
o    Data as at the end of December.
p    2009.
q    Users in the last month.
r    Population aged 15 to 59 years.
s    Excluding data from some regions, provinces or states.
t    2004.