a    2017
b    Mega city.
c    2018
d    Estimate.
e    2016
f    Data classified according to ISIC Rev. 3.
g    Data refer to fiscal years ending 30 June.
h    2013
i    Data refers to a 5-year period preceding the reference year.
j    2015
k    Including refugees.
l    Data as at the end of December.
m    Data revision.
n    Data refer to fiscal years beginning 1 July.
o    2004
p    2009
q    2014