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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $74,693,978 | $91,813,087 | $130,973,916 | $185,080,118 | $160,718,991 | $130,971,730 | $239,883,081 |
| Total | $74,693,978 | $91,813,087 | $130,973,916 | $185,080,118 | $160,718,991 | $130,971,730 | $239,883,081 |
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