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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,432,136 | 13 | 204,913 |
| 2006 | $23,728,964 | 0 | 234,906 |
| 2007 | $23,933,991 | 0 | 231,940 |
| 2008 | $44,403,566 | 0 | 34,830,488 |
| 2009 | $105,903,569 | 0 | 22,228,808 |
| 2010 | $101,880,360 | 0 | 1,325,100 |
| 2011 | $181,753,248 | 0 | 2,081,073 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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