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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $968,412,929 | 0 | 15,233,446 |
| 2006 | $1,436,883,284 | 0 | 19,740,862 |
| 2007 | $982,912,857 | 0 | 16,629,722 |
| 2008 | $1,878,491,788 | 0 | 18,281,115 |
| 2009 | $556,670,640 | 0 | 9,893,948 |
| 2010 | $776,077,054 | 0 | 12,648,414 |
| 2011 | $949,797,670 | 0 | 13,091,716 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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