The International Cocoa organization provides free access to basic statistics on prices see the monthly market reviews. It also has a section on the chocolate industry
For trade try UNCTAD – there is a special report from 2008 for cocoa.
You can also trace recent statistics fro cocoa and chocolate on the UNCTAD stats website.
The Fairtrade foundation has some data on fairtrade cocoa product sales in the UK; there are also case studies for fairtrade chocolate
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