a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    2016
f    Data classified according to ISIC Rev. 3.
g    2014
h    Data refers to a 5-year period preceding the reference year.
i    2015
j    Including refugees.
k    Refers to foreign citizens.
l    Data as at the end of December.
m    2004
n    Population aged 5 years and over.
o    2002
p    2008
q    Break in the time series.
r    Including nationals residing abroad.