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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,019,309 | 0 | 344,600 |
| 2006 | $5,640,598 | 0 | 243,282 |
| 2007 | $17,094,923 | 0 | 489,063 |
| 2008 | $44,517,786 | 0 | 837,040 |
| 2009 | $92,566,427 | 0 | 3,024,795 |
| 2010 | $67,620,248 | 0 | 1,099,802 |
| 2011 | $102,858,312 | 0 | 1,689,982 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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