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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $20,756,896 | 0 | 1,393,607 |
| 2006 | $18,973,844 | 0 | 1,174,086 |
| 2007 | $9,666,592 | 0 | 443,280 |
| 2008 | $27,356,973 | 0 | 808,822 |
| 2009 | $27,938,974 | 0 | 710,357 |
| 2010 | $15,263,655 | 0 | 392,039 |
| 2011 | $40,073,047 | 0 | 794,497 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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