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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $504,424,706 | $720,723,001 | $632,808,064 | $644,580,218 | $681,345,645 | $543,789,477 | $863,520,837 |
| Total | $504,424,706 | $720,723,001 | $632,808,064 | $644,580,218 | $681,345,645 | $543,789,477 | $863,520,837 |
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