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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $8,545 | 0 | 242 |
| 2006 | $5,491 | 0 | 91 |
| 2007 | $738,651 | 0 | 19,370 |
| 2008 | $72,535,870 | 0 | 1,120,952 |
| 2009 | $1,289,653 | 0 | 24,956 |
| 2010 | $1,067,701 | 0 | 23,054 |
| 2011 | $1,323,827 | 0 | 32,444 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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