a    Including Zanzibar.
b    Projected estimate (medium fertility variant).
c    2019
d    2018
e    2020
f    Tanzania mainland only, excluding Zanzibar.
g    Estimate.
h    For Tanganyika only.
i    Break in the time series.
j    Data refers to a 5-year period preceding the reference year.
k    Including refugees.
l    Data as at the end of December.
m    Data revision.
n    2014
o    2016
p    Data are as at 1 January of reporting year.
q    Population aged 18 years and over.
r    2017
s    Excluding business enterprise.
t    Partial data.
u    2013