a    Projected estimate (medium fertility variant).
b    2019
c    Mega city.
d    2020
e    Estimate.
f    Calculated by the UN Statistics Division from national indices.
g    Data refers to a 5-year period preceding the reference year.
h    Including refugees.
i    Data as at the end of December.
j    Data refer to fiscal years beginning 1 July.
k    2018
l    2009
m    2013
n    Data are as at 1 January of reporting year.
o    2017