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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $70,038,997 | 0 | 1,453,673 |
| 2006 | $62,515,894 | 0 | 1,320,780 |
| 2007 | $252,998,411 | 0 | 2,931,052 |
| 2008 | $347,111,886 | 0 | 2,955,768 |
| 2009 | $120,885,225 | 0 | 1,593,910 |
| 2011 | $228,030,879 | 0 | 3,258,777 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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