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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $623,988,473 | 1,319 | 9,138,765 |
| 2006 | $335,986,016 | 1,810 | 0 |
| 2007 | $413,001,907 | 0 | 6,989,777 |
| 2008 | $710,633,183 | 0 | 8,655,249 |
| 2009 | $399,640,253 | 0 | 7,355,344 |
| 2010 | $186,615,961 | 0 | 3,753,081 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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