a    Land area only.
b    2017
c    2019
d    2018
e    Estimate.
f    Index base: fiscal (solar) year 2016 (21 March 2016 - 20 March 2017)=100.
g    2016
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    Year ending 20 March of the year stated.
j    Data refers to a 5-year period preceding the reference year.
k    Including refugees.
l    Data as at the end of December.
m    Provisional data.
n    2006
o    2014
p    2009
q    Data are as at 1 January of reporting year.
r    Population aged 6 years and over.
s    Excluding private non-profit.
t    Excluding government.
u    Break in the time series.
v    Data refer to the Iranian Year which begins on 21 March and ends on 20 March of the following year.