 By comparison, US GDP in 2006 was $12.456 trillion.The data for turnover in the futures markets in 1970, 1980, and 1990 is based on the number of contracts traded, which is reported by the organized exchanges, such as the Chicago Board of Trade, the Chicago Mercantile Exchange, and the New York Commodity Exchange, and compiled in data appendices of the Annual Reports of the U.S. Commodity Futures Trading Commission.The pie charts below show the dramatic shift in the types of futures contracts traded from 1970 to 2004.