Detroit’s Cobo Center, where the North American International Auto Show is held, more than doubled its revenue in the last year, according to the agency that runs it.

The center ended fiscal 2011 on Sept. 30 with $7.6 million of operating revenue compared to $3.6 million in 2010. At the same time, federal and state subsidies dropped 37%, to $12.5 million, according to an audit released by the Detroit Regional Convention Facility Authoritylast week.

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