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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $429,667,858 | 0 | 6,686,829 |
| 2006 | $391,867,663 | 0 | 6,446,115 |
| 2007 | $529,664,323 | 0 | 8,371,308 |
| 2008 | $938,367,770 | 0 | 17,643,551 |
| 2009 | $346,613,772 | 0 | 5,613,561 |
| 2010 | $232,943,240 | 0 | 4,350,000 |
| 2011 | $315,664,758 | 0 | 5,225,926 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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