a    2017
b    Refers to the functional urban area.
c    2018
d    Data classified according to ISIC Rev. 4.
e    Estimate.
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    Provisional data.
l    2003
m    2004
n    Partial data.
o    2001
p    Break in the time series.
q    2009
r    2013
s    2014