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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $880 | 0 | 1,025 |
| 2006 | $3,436 | 0 | 3,144 |
| 2007 | $128,905,971 | 0 | 3,871,050 |
| 2008 | $114,179,185 | 0 | 9,042,230 |
| 2009 | $112,916,214 | 0 | 7,625,817 |
| 2010 | $131,490,730 | 0 | 7,789,491 |
| 2011 | $207,048,251 | 0 | 4,981,628 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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