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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $78,156,648 | 0 | 1,693,899 |
| 2006 | $194,526,504 | 0 | 2,503,166 |
| 2007 | $154,938,239 | 0 | 2,270,934 |
| 2008 | $536,924,403 | 0 | 4,738,248 |
| 2009 | $603,595,683 | 0 | 6,909,478 |
| 2010 | $366,315,584 | 0 | 5,283,657 |
| 2011 | $383,666,666 | 0 | 5,027,028 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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