a    Projected estimate (medium fertility variant).
b    Land area only.
c    2019
d    2020
e    Estimate.
f    Index base: fiscal (solar) year 2016 (21 March 2016 - 20 March 2017)=100.
g    Year ending 20 March of the year stated.
h    Data include oil and gas. The value of oil exports and total exports are rough estimates based on information published in various petroleum industry journals.
i    Data refers to a 5-year period preceding the reference year.
j    Refers to foreign citizens.
k    Including refugees.
l    Data as at the end of December.
m    2018
n    2006
o    2017
p    2014
q    2009
r    Data are as at 1 January of reporting year.
s    Population aged 6 years and over.
t    Proportion of individuals using internet is 45.33%.
u    Excluding private non-profit.
v    Excluding government.
w    Break in the time series.
x    Data refer to the Iranian Year which begins on 21 March and ends on 20 March of the following year.