a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    2016
f    Excluding water and waste management.
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    2000
l    Population aged 16 to 74 years.
m    Users in the last 3 months.
n    2004
o    Border statistics are not collected any more, surveys used instead.
p    Calculated on the basis of accommodation statistics and “Foreign Visitor Survey” carried out by the Statistical Office of Estonia.
q    Based on mobile positioning data.