a    2017
b    2019
c    2018
d    Data classified according to ISIC Rev. 4.
e    Excludes publishing activities. Includes irrigation and canals.
f    Excludes repair of personal and household goods.
g    Excludes computer and related activities and radio/TV activities.
h    Estimate.
i    2016
j    General Extra-EU/Special Intra-EU
k    Data refers to a 5-year period preceding the reference year.
l    Data as at the end of December.
m    Almost all people recorded as being stateless have permanent residence and enjoy more rights than foreseen in the 1954 Convention relating to the Status of Stateless Persons.
n    Data are as at 1 January of reporting year.
o    Users in the last 3 months.
p    Population aged 16 to 74 years.
q    Provisional data.
r    Border statistics are not collected any more, surveys used instead.
s    Based on mobile positioning data.