a    Projected estimate (medium fertility variant).
b    2015.
c    2011.
d    2016.
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Industrial workers.
h    2014.
i    Data classified according to ISIC Rev. 3.
j    Twelve months beginning 1 April of the year stated.
k    Excluding military goods, fissionable materials, bunkers, ships and aircraft.
l    Data refers to a 5-year period preceding the reference year.
m    Including refugees.
n    Data as at the end of December.
o    General government expenditure series was fully revised.
p    Data revision.
q    Break in the time series.
r    2013.
s    2003.
t    2004.
u    Excluding nationals residing abroad.