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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $40,358,801 | 0 | 3,977,747 |
| 2006 | $42,644,916 | 0 | 3,285,650 |
| 2007 | $50,108,263 | 0 | 3,527,716 |
| 2008 | $35,062,319 | 0 | 2,336,698 |
| 2009 | $40,695,546 | 0 | 2,160,986 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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