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CITYPOP*http://www.stats.gov.cn/english/index.htm
DIVA*http://www.cipotato.org/DIVA/data/DataServer.asp?AREA=CHN&THEME=_adm
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CIA*https://www.cia.gov/cia/publications/factbook/geos/ch.html
ISO3166_1*https://www.cia.gov/library/publications/the-world-factbook/
ISO3166_2*https://www.cia.gov/library/publications/the-world-factbook/