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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $89,547,391 | $45,023,195 | $85,926,701 | $64,905,103 | $38,412,740 | $40,930,241 | $47,584,436 |
| Total | $89,547,391 | $45,023,195 | $85,926,701 | $64,905,103 | $38,412,740 | $40,930,241 | $47,584,436 |
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