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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $85,825,309 | 0 | 3,112,967 |
| 2006 | $168,615,380 | 0 | 4,788,860 |
| 2007 | $325,741,836 | 0 | 7,761,399 |
| 2008 | $599,304,574 | 0 | 7,780,476 |
| 2009 | $450,170,951 | 0 | 7,402,610 |
| 2010 | $370,634,009 | 0 | 6,310,159 |
| 2011 | $444,112,336 | 0 | 6,779,100 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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