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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $163,321,249 | 33,347,332 | 4,196,332 |
| 2006 | $205,649,452 | 0 | 4,046,487 |
| 2007 | $56,929,369 | 0 | 264,886,303 |
| 2008 | $248,764,245 | 0 | 1,310,071,065 |
| 2009 | $188,236,054 | 0 | 26,795,863 |
| 2010 | $368,444,846 | 0 | 5,605,548 |
| 2011 | $252,779,247 | 0 | 3,263,636 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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