a    2017
b    2018
c    Data classified according to ISIC Rev. 4.
d    Estimate.
e    Provisional data.
f    Break in the time series.
g    2016
h    Data refers to a 5-year period preceding the reference year.
i    2015
j    Refers to foreign citizens.
k    Data revision.
l    2004
m    2009
n    2003
o    2008
p    2014
q    2013
r    Population aged 15 years and over.
s    Arrivals by air.