a    The land area of Singapore comprises the mainland and other islands.
b    2017
c    2019
d    2018
e    Data classified according to ISIC Rev. 4.
f    Excludes publishing activities. Includes irrigation and canals.
g    Excluding mining and quarrying.
h    Excludes repair of personal and household goods.
i    Excludes computer and related activities and radio/TV activities.
j    Estimate.
k    2016
l    Data refers to a 5-year period preceding the reference year.
m    Data as at the end of December.
n    Medisave is classified as Social insurance scheme, considering that it is a compulsory payment.
o    Data refer to fiscal years beginning 1 April.
p    Provisional data.
q    2014
r    2013
s    Data are as at 1 January of reporting year.
t    Population aged 7 years and over.
u    Excluding Malaysian citizens arriving by land.