a    Projected estimate (medium fertility variant).
b    2015.
c    2014.
d    2016.
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Series linked to former series.
h    Data classified according to ISIC Rev. 3.
i    Break in the time series.
j    Data refers to a 5-year period preceding the reference year.
k    Data as at the end of December.
l    2012.
m    2000.
n    2013.
o    Partial data.
p    2004.
q    Arrivals by air.