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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $51,780,753 | 0 | 1,961,975 |
| 2006 | $32,359,394 | 0 | 1,006,959 |
| 2007 | $104,635,603 | 0 | 2,878,735 |
| 2008 | $152,978,608 | 0 | 3,065,072 |
| 2009 | $155,524,938 | 0 | 2,942,918 |
| 2010 | $277,813,958 | 0 | 4,354,100 |
| 2011 | $322,609,703 | 0 | 5,253,149 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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