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