a    The total surface is 21 040.79 square kilometres, without taking into account the last ruling of The Hague.
b    2017
c    Refers to the urban parts of the municipalities San Salvador, Mejicanos, Soyapango, Delgado, Ilopango, Cuscatancingo, Ayutuxtepeque and San Marcos.
d    2019
e    2018
f    Data classified according to ISIC Rev. 4.
g    Excludes publishing activities. Includes irrigation and canals.
h    Excludes computer and related activities and radio/TV activities.
i    Excludes repair of personal and household goods.
j    Estimate.
k    Urban areas.
l    2016
m    Data refers to a 5-year period preceding the reference year.
n    Including refugees.
o    Data as at the end of December.
p    2008
q    Data are as at 1 January of reporting year.
r    Population aged 10 years and over.
s    Break in the time series.