a    Projected estimate (medium fertility variant).
b    2015
c    Refers to the official Metropolitan City.
d    2017
e    2016
f    Data classified according to ISIC Rev. 4.
g    Estimate.
h    Calculated by the Statistics Division of the United Nations from national indices.
i    Excluding water and waste management.
j    2014
k    Data refers to a 5-year period preceding the reference year.
l    Data as at the end of December.
m    Population aged 16 to 74 years.
n    Population aged 6 years and over.
o    Provisional data.
p    2004
q    Including San Marino.
r    Data include San Marino and the Holy See.
s    Excluding seasonal and border workers.
t    Development Assistance Committee member (OECD).