a    Including Kosovo.
b    Changes in total area per year are the result of new measuring and correcting of the administrative borders between former Yugoslavian countries.
c    2017
d    Refers to the urban population of Belgrade area.
e    2018
f    Excluding Kosovo and Metohija.
g    Data classified according to ISIC Rev. 4.
h    Estimate.
i    2016
j    Excluding water and waste management.
k    2014
l    Data refers to a 5-year period preceding the reference year.
m    2015
n    Data as at the end of December.
o    Population aged 16 to 74 years.
p    Excluding data from some regions, provinces or states.
q    Do not correspond exactly to Frascati Manual recommendations.
r    Excluding Kosovo.