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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $251,870,325 | 0 | 4,497,000 |
| 2006 | $254,300,305 | 0 | 4,527 |
| 2007 | $229,343,940 | 0 | 4,039,000 |
| 2008 | $215,703,319 | 0 | 3,555,000 |
| 2009 | $237,975,317 | 0 | 3,732,000 |
| 2010 | $167,574,396 | 0 | 2,610,000 |
| 2011 | $200,207,981 | 0 | 2,957,000 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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