a    Projected estimate (medium fertility variant).
b    The land area of Singapore comprises the mainland and other islands.
c    2015
d    2017
e    2016
f    Including mining and quarrying.
g    Data classified according to ISIC Rev. 4.
h    Excluding mining and quarrying.
i    Estimate.
j    Data refers to a 5-year period preceding the reference year.
k    Data as at the end of December.
l    Data refer to fiscal years beginning 1 April.
m    Medisave is classified as Social insurance scheme, considering that it is a compulsory payment.
n    2013
o    Population aged 15 years and over.
p    Population aged 7 years and over.
q    2014
r    2004