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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $49,381,023 | 0 | 1,285,827 |
| 2006 | $70,357,524 | 0 | 8,449,075 |
| 2007 | $70,529,279 | 0 | 1,403,707 |
| 2008 | $122,580,307 | 0 | 961,132 |
| 2009 | $50,490,483 | 0 | 502,025 |
| 2010 | $36,374,569 | 0 | 440,840 |
| 2011 | $50,303,204 | 0 | 406,604 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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