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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $504,452,845 | 0 | 13,042,000 |
| 2006 | $1,125,879,330 | 0 | 17,546,000 |
| 2007 | $722,307,960 | 0 | 16,042,000 |
| 2008 | $1,025,222,357 | 0 | 12,755,000 |
| 2009 | $731,588,861 | 0 | 13,754,000 |
| 2010 | $1,277,478,799 | 0 | 14,933,000 |
| 2011 | $965,201,309 | 0 | 12,667,282 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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