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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $141,800,425 | $177,829,989 | $225,286,769 | $226,369,015 | $274,386,680 | $276,543,971 | $297,198,000 |
| Total | $141,800,425 | $177,829,989 | $225,286,769 | $226,369,015 | $274,386,680 | $276,543,971 | $297,198,000 |
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