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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $178,211,474 | $281,744,580 | $386,441,925 | $468,852,820 | $229,317,760 | $200,336,679 | $430,490,261 |
| Total | $178,211,474 | $281,744,580 | $386,441,925 | $468,852,820 | $229,317,760 | $200,336,679 | $430,490,261 |
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