a    2017
b    2018
c    2019
d    Estimate.
e    Bujumbura
f    2016
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 revision.
k    2014
l    Data are as at 1 January of reporting year.
m    Partial data.
n    2012
o    Break in the time series.
p    Including nationals residing abroad.