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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $518,795,820 | 9,641 | 8,039,365 |
| 2006 | $278,944,521 | 60,485 | 0 |
| 2007 | $484,780,928 | 0 | 8,857,004 |
| 2008 | $1,309,524,613 | 0 | 14,388,964 |
| 2009 | $580,213,323 | 0 | 10,639,352 |
| 2010 | $484,679,060 | 0 | 10,112,134 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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