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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $293,173,019 | 0 | 8,361,611 |
| 2006 | $327,347,690 | 0 | 7,885,016 |
| 2007 | $436,878,341 | 0 | 7,670,222 |
| 2008 | $605,724,093 | 0 | 8,275,792 |
| 2009 | $570,731,437 | 0 | 7,753,796 |
| 2010 | $381,165,571 | 0 | 6,743,132 |
| 2011 | $578,018,729 | 0 | 8,623,151 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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