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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $7,852,887 | $38,952,008 | $248,483,319 | $309,003,085 | $152,594,500 | $113,944,397 | $223,948,688 |
| Total | $7,852,887 | $38,952,008 | $248,483,319 | $309,003,085 | $152,594,500 | $113,944,397 | $223,948,688 |
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