a    Projected estimate (medium fertility variant).
b    2015
c    Mega city.
d    2017
e    2016
f    Estimate.
g    Data classified according to ISIC Rev. 3.
h    Twelve months ending 30 June of the year stated.
i    2013
j    Break in the time series.
k    Data refers to a 5-year period preceding the reference year.
l    Including refugees.
m    Data as at the end of December.
n    Data revision.
o    Data refer to fiscal years beginning 1 July.
p    2004
q    2009
r    2014