OECD/FAO (2009), "Table 2.1 - Futures market activity: Total volume of open interest contracts and distribution over commercial and non-commercial traders (Chicago Board of Trade and New York Board of Trade)",
in
OECD-FAO Agricultural Outlook 2009, OECD Publishing, Paris,
https://doi.org/10.1787/agr_outlook-2009-table2_1-en.
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