a    Projected estimate (medium fertility variant).
b    The land area of Singapore comprises the mainland and other islands.
c    2015.
d    2016.
e    Data classified according to ISIC Rev. 4.
f    Includes mining and quarrying.
g    Excludes mining and quarrying.
h    Estimate.
i    2013.
j    2014.
k    Data refers to a 5-year period preceding the reference year.
l    Data as at the end of December.
m    Includes inactive subscriptions.
n    Population aged 15 years and over.
o    Population aged 7 years and over.
p    2004.