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    Excluding water and waste management.
i    Prior to 1997, included under Belgium. See also footnote for Belgium.
j    Data refers to a 5-year period preceding the reference year.
k    Data as at the end of December.
l    2001.
m    2003.
n    2012.
o    Population aged 16 to 74 years.
p    2004.
q    Development Assistance Committee member (OECD)
r    Provisional data.