a    Data refer to 1 October.
b    2007
c    Major metropolitan areas.
d    2018
e    2017
f    Data classified according to ISIC Rev. 4.
g    At producers' prices.
h    Estimate.
i    Calculated by the UN Statistics Division from national indices.
j    2016
k    Data refers to a 5-year period preceding the reference year.
l    2015
m    Refers to foreign citizens.
n    Data as at the end of December.
o    2004
p    Population aged 6 years and over.
q    2014
r    Data include Okinawa.
s    Excluding nationals residing abroad.
t    Development Assistance Committee member (OECD).