a    2017
b    Data refers to the urban agglomeration.
c    2018
d    Data classified according to ISIC Rev. 4.
e    Estimate.
f    Rural and urban areas.
g    2016
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    2013
n    2011
o    Excluding business enterprise.
p    2007
q    2004
r    2014