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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $8,762,475 | 0 | 172,117 |
| 2006 | $29,193,936 | 0 | 517,883 |
| 2007 | $42,896,292 | 0 | 1,288,177 |
| 2008 | $69,984,414 | 0 | 1,402,204 |
| 2009 | $77,858,498 | 0 | 985,441 |
| 2010 | $143,589,533 | 0 | 2,620,247 |
| 2011 | $154,026,880 | 0 | 2,529,107 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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