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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $262,737,245 | 2 | 6,750,700 |
| 2006 | $266,689,152 | 0 | 7,449,810 |
| 2007 | $460,230,027 | 0 | 11,603,625 |
| 2008 | $387,259,287 | 0 | 9,466,863 |
| 2009 | $360,108,871 | 0 | 9,797,604 |
| 2010 | $731,984,458 | 0 | 9,749,101 |
| 2011 | $456,693,219 | 0 | 11,159,743 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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