The open interest for the corn futures contract was 30,631 hitting the 3 year high today. The last time it reached beyond 30,000 contracts was September 15, 2011, when the contract was traded on the Tokyo Grain Exchange. The contract was transferred to TOCOM in February 2013.
FTSE Mondo Visione Exchanges Index:
TOCOM Corn Open Interest Tops 30,000 Contracts - 3 Year High
Date 04/09/2014