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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $49,577,992 | 12 | 973,836 |
| 2006 | $91,122,632 | 26 | 0 |
| 2007 | $104,717,871 | 0 | 3,144,681 |
| 2008 | $128,032,246 | 0 | 1,689,295 |
| 2009 | $138,694,871 | 0 | 1,747,088 |
| 2010 | $117,539,012 | 0 | 1,768,500 |
| 2011 | $117,498,248 | 0 | 1,554,098 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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