a    2017
b    Refers to Grand Tunis.
c    2018
d    At factor cost.
e    Estimate.
f    Provisional data.
g    Break in the time series.
h    2016
i    2014
j    Data refers to a 5-year period preceding the reference year.
k    2015
l    Refers to foreign citizens.
m    Including refugees.
n    Data as at the end of December.
o    2012
p    2004
q    Excluding nationals residing abroad.