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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $130,814,647 | 0 | 3,133,901 |
| 2006 | $132,513,246 | 0 | 4,032,738 |
| 2007 | $89,214,602 | 0 | 1,367,828 |
| 2008 | $99,559,133 | 0 | 1,445,749 |
| 2009 | $89,891,816 | 0 | 1,851,373 |
| 2010 | $44,048,958 | 0 | 928,647 |
| 2011 | $51,076,506 | 0 | 844,166 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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