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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $29,841,338 | $77,032,273 | $137,982,115 | $202,458,484 | $195,266,442 | $254,114,941 | $299,895,802 |
| Total | $29,841,338 | $77,032,273 | $137,982,115 | $202,458,484 | $195,266,442 | $254,114,941 | $299,895,802 |
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