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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $314,794,359 | 0 | 6,557,087 |
| 2006 | $488,379,378 | 0 | 8,382,463 |
| 2007 | $433,262,927 | 0 | 5,958,701 |
| 2008 | $366,819,938 | 0 | 3,941,137 |
| 2009 | $282,816,045 | 0 | 3,686,684 |
| 2010 | $418,755,848 | 0 | 6,259,425 |
| 2011 | $686,510,484 | 0 | 9,416,165 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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