a    Projected estimate (medium fertility variant).
b    2015.
c    Refers to the population of Brussels-Capital Region and 'communes' of the agglomeration and suburbs.
d    2016.
e    Data classified according to ISIC Rev. 4.
f    Estimate.
g    Series linked to former series.
h    2014.
i    Prior to 1997, the data refer to the Economic Union of Belgium and Luxembourg and intertrade between the two countries is excluded. Beginning January 1997, data refer to Belgium only and include trade between Belgium and Luxembourg.
j    Data refers to a 5-year period preceding the reference year.
k    Refers to foreign citizens.
l    Data as at the end of December.
m    Data refer to offences, not victims, of intentional homicide.
n    Population aged 16 to 74 years.
o    2004.
p    Break in the time series.
q    Development Assistance Committee member (OECD)
r    Provisional data.