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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,852,887 | 0 | 153,954 |
| 2006 | $38,952,008 | 36 | 426,776 |
| 2007 | $248,483,319 | 0 | 4,945,433 |
| 2008 | $309,003,085 | 0 | 2,708,767 |
| 2009 | $152,594,500 | 0 | 2,146,739 |
| 2010 | $113,944,397 | 0 | 1,853,111 |
| 2011 | $223,948,688 | 0 | 3,002,552 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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