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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $136,489,278 | 0 | 10,273,216 |
| 2006 | $80,229,550 | 0 | 5,116,690 |
| 2007 | $112,776,839 | 0 | 5,669,999 |
| 2008 | $58,958,978 | 0 | 3,105,175 |
| 2009 | $67,008,753 | 0 | 3,065,936 |
| 2010 | $42,389,419 | 0 | 1,644,354 |
| 2011 | $45,370,025 | 0 | 751,114 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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