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Database and statistics of Japan
Here are some "useful" websites for your reference in Japan.
When you are looking for some basic and credible data/statistics for Japan and its market, you may find these websites below are quite useful!
Statistics/Census of Japan (e.g. population and households data, etc)
"Economic and Financial Data for Japan "
Economic Statistics and reports by Cabinet Office of Japan
Automotive Marketing database
Telecommunications Carriers Association(TCA)
Japan Electrical Manufacturers' Association(JEMA)
Japan External Trade Organization(JETRO)
Statistic of finance (household income/paid tax amount, etc)