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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $74,693,978 | 0 | 2,854,556 |
| 2006 | $91,813,087 | 0 | 2,809,649 |
| 2007 | $130,973,916 | 0 | 3,503,902 |
| 2008 | $185,080,118 | 0 | 2,930,185 |
| 2009 | $160,718,991 | 0 | 2,839,905 |
| 2010 | $130,971,730 | 0 | 2,118,235 |
| 2011 | $239,883,081 | 0 | 3,649,397 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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