a    Including Zanzibar.
b    2017
c    2018
d    Tanzania mainland only, excluding Zanzibar.
e    2016
f    Data classified according to ISIC Rev. 4.
g    Estimate.
h    Data refers to a 5-year period preceding the reference year.
i    2015
j    Including refugees.
k    Data as at the end of December.
l    Data revision.
m    2002
n    2014
o    2004
p    Partial data.
q    Excluding business enterprise.
r    2013