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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $17,877,392 | 0 | 351,157 |
| 2006 | $17,416,912 | 0 | 663,953 |
| 2007 | $9,751,989 | 0 | 322,574 |
| 2008 | $2,354,293 | 0 | 361,732 |
| 2009 | $529,360 | 0 | 324,823 |
| 2010 | $26,220,180 | 0 | 757,226 |
| 2011 | $87,514,499 | 0 | 1,533,066 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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