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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,011,775,042 | 0 | 18,607,276 |
| 2006 | $967,404,776 | 0 | 22,074,580 |
| 2007 | $925,630,733 | 0 | 18,431,332 |
| 2008 | $1,254,910,977 | 0 | 23,499,182 |
| 2009 | $568,067,702 | 0 | 17,369,576 |
| 2010 | $631,231,499 | 0 | 18,520,048 |
| 2011 | $374,181,973 | 0 | 14,384,619 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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