a    Projected estimate (medium fertility variant).
b    2015.
c    2016.
d    Estimate.
e    African population.
f    Brazzaville
g    Series linked to former series.
h    2013.
i    2014.
j    Data classified according to ISIC Rev. 3.
k    Country data supplemented with data from the Observatoire Economique et Statistique d´Afrique Subsaharienne (Afristat).
l    Data refers to manufacturing and utilities only.
m    2009.
n    Data refers to a 5-year period preceding the reference year.
o    Data as at the end of December.
p    2004.
q    2007.
r    2012.
s    2003.
t    Including nationals residing abroad.