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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $100,345,495 | 48 | 1,971,037 |
| 2006 | $193,174,994 | 0 | 4,939,985 |
| 2007 | $96,431,807 | 0 | 2,279,723 |
| 2008 | $214,765,681 | 0 | 2,644,295 |
| 2009 | $381,733,921 | 0 | 2,663,453 |
| 2010 | $60,161,386 | 0 | 1,407,211 |
| 2011 | $83,704,035 | 0 | 996,752 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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