a    Projected estimate (medium fertility variant).
b    For statistical purposes, the data for China do not include those for the Hong Kong Special Administrative Region (Hong Kong SAR), Macao Special Administrative Region (Macao SAR) and Taiwan Province of China.
c    2019
d    Refers to all city districts (excluding Yanqing District) meeting the criteria such as contiguous built-up areas, being the location of the local government, being a Street or Having a Resident Committee.
e    2020
f    Includes taxes less subsidies on production and imports.
g    Gas distribution is included in Wholesale and retail trade.
h    Excludes repair of motor vehicles and motorcycles, personal and household goods.
i    Estimate.
j    Index base: 2015=100.
k    Data refers to a 5-year period preceding the reference year.
l    Refers to foreign citizens.
m    2018
n    2017
o    Data are as at 1 January of reporting year.
p    Users in the last 6 months.
q    Population aged 6 years and over.
r    Data refer to permanent residents.
s    Including arrivals of non-residents visitors through border areas in China.