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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $32,679,539 | 0 | 641,908 |
| 2006 | $175,109,665 | 0 | 2,511,784 |
| 2007 | $147,789,375 | 0 | 2,793,988 |
| 2008 | $264,078,180 | 0 | 3,286,786 |
| 2009 | $166,606,858 | 0 | 3,304,437 |
| 2010 | $388,842,024 | 0 | 5,083,547 |
| 2011 | $281,755,552 | 0 | 3,712,713 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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