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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $552,778,373 | 0 | 7,632,328 |
| 2006 | $255,137,019 | 0 | 2,893,354 |
| 2007 | $257,397,384 | 0 | 3,300,014 |
| 2008 | $289,595,178 | 0 | 3,683,777 |
| 2009 | $169,819,396 | 0 | 3,201,318 |
| 2010 | $193,210,016 | 0 | 3,206,283 |
| 2011 | $221,549,841 | 0 | 2,759,909 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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