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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $55,011,432 | 0 | 1,930,000 |
| 2006 | $73,087,737 | 0 | 2,285,000 |
| 2007 | $51,033,263 | 0 | 1,421,849 |
| 2008 | $51,701,118 | 0 | 1,034,565 |
| 2009 | $66,577,533 | 0 | 1,405,063 |
| 2010 | $32,807,596 | 0 | 952,000 |
| 2011 | $36,241,931 | 0 | 860,438 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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