a    2017
b    Refers to Muscat governorate.
c    2019
d    2018
e    Estimate.
f    2016
g    Areas not elsewhere specified.
h    Data refers to a 5-year period preceding the reference year.
i    Refers to foreign citizens.
j    Data as at the end of December.
k    2009
l    2013
m    Data are as at 1 January of reporting year.
n    Population aged 5 years and over.
o    Partial data.