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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $62,238,497 | 0 | 4,552,268 |
| 2006 | $70,626,631 | 0 | 4,056,855 |
| 2007 | $95,918,018 | 0 | 3,665,171 |
| 2008 | $134,619,801 | 0 | 2,959,059 |
| 2009 | $80,296,729 | 0 | 1,940,135 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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