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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,035,097 | 0 | 706,952 |
| 2006 | $6,907,279 | 0 | 302,167 |
| 2007 | $15,655,401 | 0 | 420,698 |
| 2008 | $23,205,764 | 0 | 416,228 |
| 2009 | $50,232,980 | 0 | 1,180,514 |
| 2010 | $78,707,379 | 0 | 1,278,741 |
| 2011 | $154,922,119 | 0 | 2,379,489 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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