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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $99,931,800 | $122,489,900 | $129,106,100 | $113,115,400 | $193,787,100 | $135,338,200 | $351,860,500 |
| Total | $99,931,800 | $122,489,900 | $129,106,100 | $113,115,400 | $193,787,100 | $135,338,200 | $351,860,500 |
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