a    Projected estimate (medium fertility variant).
b    2015
c    2017
d    2016
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Break in the time series.
h    Calculated by the Statistics Division of the United Nations from national indices.
i    Data classified according to ISIC Rev. 3.
j    2011
k    Data refers to a 5-year period preceding the reference year.
l    Data as at the end of December.
m    Data revision.
n    2003
o    2009
p    2013
q    2004
r    2012
s    2014
t    2006
u    Excluding nationals residing abroad.