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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $20,447,217 | 0 | 401,635 |
| 2006 | $25,076,601 | 0 | 2,508,475 |
| 2007 | $32,462,609 | 0 | 2,387,807 |
| 2008 | $25,105,387 | 0 | 579,900 |
| 2009 | $37,322,030 | 0 | 912,800 |
| 2010 | $48,375,143 | 0 | 1,635,904 |
| 2011 | $80,407,189 | 0 | 2,794,928 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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