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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $173,838,811 | 0 | 5,223,571 |
| 2006 | $211,648,538 | 0 | 5,261,579 |
| 2007 | $196,185,697 | 0 | 3,358,751 |
| 2008 | $402,675,282 | 0 | 5,160,499 |
| 2009 | $189,708,712 | 0 | 2,946,264 |
| 2010 | $185,457,558 | 0 | 3,041,160 |
| 2011 | $165,659,709 | 0 | 2,457,212 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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