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| Year | Trade Value | Weight (kg) | Quantity |
| 2007 | $182,320 | 0 | 1,169 |
| 2008 | $47,125,779 | 0 | 265,683 |
| 2009 | $1,096,087,173 | 0 | 4,745,912 |
| 2010 | $346,841,650 | 0 | 6,329,228 |
| 2011 | $552,378,551 | 0 | 2,469,641 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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