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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $94,149,010 | $243,218,844 | $155,586,696 | $163,846,938 | $99,688,690 | $281,879,158 | $456,300,573 |
| Total | $94,149,010 | $243,218,844 | $155,586,696 | $163,846,938 | $99,688,690 | $281,879,158 | $456,300,573 |
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