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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $82,687,471 | 0 | 4,841,676 |
| 2006 | $42,945,325 | 0 | 2,117,468 |
| 2007 | $71,461,235 | 0 | 2,538,865 |
| 2008 | $116,209,907 | 0 | 2,666,008 |
| 2009 | $118,363,201 | 0 | 3,632,208 |
| 2010 | $79,031,235 | 0 | 1,318,905 |
| 2011 | $150,675,214 | 0 | 2,253,767 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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