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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,117,769 | 0 | 121,783 |
| 2006 | $2,297,511 | 0 | 82,758 |
| 2007 | $16,814,320 | 0 | 634,996 |
| 2008 | $16,140,004 | 0 | 679,560 |
| 2009 | $20,077,008 | 0 | 749,433 |
| 2010 | $36,537,719 | 0 | 1,524,282 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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