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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $310,991,078 | 0 | 6,787,710 |
| 2006 | $478,818,892 | 0 | 9,292,462 |
| 2007 | $356,649,911 | 0 | 6,103,554 |
| 2008 | $404,997,408 | 0 | 5,576,251 |
| 2009 | $387,661,654 | 0 | 6,449,182 |
| 2010 | $532,979,591 | 0 | 8,760,871 |
| 2011 | $892,978,812 | 0 | 12,286,059 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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