a    2017
b    Break in the time series.
c    2016
d    2018
e    Data classified according to ISIC Rev. 3.
f    Population aged 16 years and over.
g    Data refers to a 5-year period preceding the reference year.
h    2019
i    2013
j    2006
k    2011
l    De jure population.
m    Including armed forces stationed in the area.
n    Data refers to a 2-year period up to and including the reference year.
o    2012
p    Partial data.
q    Estimate.