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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $19,565,033 | 9 | 244,970 |
| 2007 | $33,178,581 | 0 | 902,236 |
| 2008 | $43,758,073 | 0 | 927,358 |
| 2009 | $51,115,060 | 0 | 1,074,284 |
| 2010 | $28,124,646 | 0 | 492,559 |
| 2011 | $28,103,262 | 0 | 508,900 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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