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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $259,729,614 | 0 | 5,011,193 |
| 2006 | $278,431,678 | 0 | 5,388,708 |
| 2007 | $236,529,286 | 0 | 4,251,231 |
| 2008 | $232,460,643 | 0 | 3,841,847 |
| 2009 | $311,809,536 | 0 | 6,006,500 |
| 2010 | $274,360,075 | 0 | 5,544,676 |
| 2011 | $318,123,688 | 0 | 6,562,390 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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