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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical energy (optional heading) | $623,935,343 | $613,375,909 | $637,381,394 | $632,524,430 | $647,663,638 | $634,687,742 | $618,438,564 |
| Total | $623,935,343 | $613,375,909 | $637,381,394 | $632,524,430 | $647,663,638 | $634,687,742 | $618,438,564 |
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