a    2017
b    Refers to Greater Cairo as the sum of the Governorate of Al-Qahirah (Cairo) and the surrounding districts of the Governorates of Al-Jizah (Giza) and Al-Qalyübyah (Qalyubia).
c    2018
d    At factor cost.
e    Estimate.
f    Urban areas.
g    2016
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    2003
m    2008
n    2004
o    2012
p    Population aged 6 years and over.
q    Partial data.
r    Government only.
s    Excluding private non-profit.
t    Excluding business enterprise.
u    2014