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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $105,892,799 | 0 | 1,045,890 |
| 2006 | $197,391,073 | 0 | 2,894,953 |
| 2007 | $110,143,683 | 0 | 1,906,861 |
| 2008 | $4,070,305 | 0 | 81,552 |
| 2009 | $36,406,394 | 0 | 700,932 |
| 2010 | $91,420,626 | 0 | 1,717,000 |
| 2011 | $116,941,734 | 0 | 1,920,172 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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