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| Year | Trade Value | Weight (kg) | Quantity |
| 2007 | $330,249,573 | 0 | 4,477,084 |
| 2008 | $564,785,931 | 0 | 5,841,527 |
| 2009 | $359,658,970 | 0 | 5,241,792 |
| 2010 | $444,712,238 | 0 | 7,223,234 |
| 2011 | $602,153,801 | 0 | 8,963,245 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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