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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,340,455 | 0 | 137,216 |
| 2006 | $8,713,608 | 0 | 353,293 |
| 2007 | $12,254,751 | 0 | 400,373 |
| 2008 | $3,685,534 | 0 | 338,045 |
| 2009 | $1,926,702 | 0 | 295,324 |
| 2010 | $5,605,781 | 0 | 224,675 |
| 2011 | $9,463,950 | 0 | 204,528 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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