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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $478,799,267 | 0 | 7,990,575 |
| 2006 | $655,798,372 | 0 | 8,983,485 |
| 2007 | $528,812,521 | 0 | 9,463,644 |
| 2008 | $696,057,214 | 0 | 6,709,908 |
| 2009 | $617,318,261 | 0 | 11,469,504 |
| 2010 | $708,137,104 | 0 | 11,970,585 |
| 2011 | $758,813,782 | 0 | 10,527,780 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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