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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $381,652,115 | 0 | 5,965,144 |
| 2006 | $684,780,781 | 0 | 7,850,589 |
| 2007 | $851,661,500 | 0 | 9,686,656 |
| 2008 | $1,108,418,193 | 0 | 9,522,123 |
| 2009 | $1,398,909,167 | 0 | 18,486,036 |
| 2010 | $1,432,153,489 | 0 | 19,370,838 |
| 2011 | $661,455,897 | 0 | 10,641,235 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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