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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $38,217,088 | 3 | 1,600,219 |
| 2006 | $73,142,483 | 9 | 2,881,541 |
| 2007 | $87,326,157 | 0 | 2,931,346 |
| 2008 | $137,962,633 | 0 | 2,958,056 |
| 2009 | $362,769 | 0 | 6,898 |
| 2010 | $2,108,132 | 0 | 24,878 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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