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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $549,902,879 | $668,253,394 | $543,452,319 | $989,436,091 | $661,306,334 | $1,028,285,294 | $1,104,441,232 |
| Total | $549,902,879 | $668,253,394 | $543,452,319 | $989,436,091 | $661,306,334 | $1,028,285,294 | $1,104,441,232 |
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