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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $39,912,580 | 0 | 1,468,431 |
| 2006 | $23,681,331 | 0 | 856,608 |
| 2007 | $14,057,076 | 0 | 532,419 |
| 2008 | $22,339,676 | 0 | 758,339 |
| 2009 | $10,119,346 | 0 | 254,802 |
| 2010 | $13,078,836 | 0 | 222,076 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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