a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    Calculated by the UN Statistics Division from national indices.
f    2016
g    Data refers to a 5-year period preceding the reference year.
h    2015
i    Including refugees.
j    Data as at the end of December.
k    Data revision.
l    2004
m    2006
n    2013
o    2011
p    Overestimated or based on overestimated data.
q    S&T budget instead of R&D expenditure.
r    2002
s    Break in the time series.
t    Excluding business enterprise.
u    2014
v    The data correspond only to 12 border posts.
w    The data of all the border posts of the country are used.