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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $94,149,010 | 0 | 2,419,039 |
| 2006 | $243,218,844 | 0 | 5,574,439 |
| 2007 | $155,586,696 | 0 | 3,096,560 |
| 2008 | $163,846,938 | 0 | 3,080,713 |
| 2009 | $99,688,690 | 0 | 1,207,640 |
| 2010 | $281,879,158 | 0 | 4,936,668 |
| 2011 | $456,300,573 | 0 | 7,554,194 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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