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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $10,391,007 | 0 | 206,526 |
| 2007 | $90,751,542 | 0 | 1,519,957 |
| 2008 | $66,854,392 | 0 | 741,870 |
| 2009 | $108,489,855 | 0 | 1,514,857 |
| 2010 | $80,213,076 | 0 | 1,404,805 |
| 2011 | $90,036,175 | 0 | 1,236,139 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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