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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $24,216,663 | 0 | 1,064,233 |
| 2006 | $37,387,794 | 0 | 1,432,793 |
| 2007 | $41,748,699 | 0 | 1,273,624 |
| 2008 | $79,743,904 | 0 | 1,647,024 |
| 2009 | $31,531,235 | 0 | 674,228 |
| 2010 | $353,872,526 | 0 | 7,040,242 |
| 2011 | $518,895,668 | 0 | 8,800,741 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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