a    Projected estimate (medium fertility variant).
b    2015
c    2017
d    2016
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Excluding water and waste management.
h    2014
i    Data refers to a 5-year period preceding the reference year.
j    Data as at the end of December.
k    2000
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    Calculated on the basis of accommodation statistics and “Foreign Visitor Survey” carried out by the Statistical Office of Estonia.
r    Based on mobile positioning data.