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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $73,459,450 | 0 | 1,814 |
| 2006 | $122,121,205 | 0 | 2,690 |
| 2007 | $119,154,327 | 0 | 2,252,087,040 |
| 2008 | $31,036,035 | 0 | 569,899,008 |
| 2009 | $10,271,268 | 0 | 198,968,000 |
| 2010 | $14,890,828 | 0 | 252,803,008 |
| 2011 | $5,045,145 | 0 | 37,364,000 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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