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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $29,841,338 | 0 | 340,819 |
| 2006 | $77,032,273 | 0 | 964,523 |
| 2007 | $137,982,115 | 0 | 1,683,403 |
| 2008 | $202,458,484 | 0 | 2,310,888 |
| 2009 | $195,266,442 | 0 | 2,226,730 |
| 2010 | $254,114,941 | 0 | 4,450,422 |
| 2011 | $299,895,802 | 0 | 3,164,801 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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