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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $719,513,611 | 0 | 19,822,000 |
| 2006 | $619,190,035 | 0 | 11,497,000 |
| 2007 | $536,436,565 | 0 | 14,729,000 |
| 2008 | $1,026,659,949 | 0 | 14,710,000 |
| 2009 | $451,095,894 | 0 | 9,081,000 |
| 2010 | $785,407,943 | 0 | 13,145,583 |
| 2011 | $1,282,198,553 | 0 | 19,596,000 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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