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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,349,080,847 | 0 | 82,936,860 |
| 2006 | $3,905,140,969 | 0 | 70,326,556 |
| 2007 | $3,158,391,810 | 0 | 65,300,845 |
| 2008 | $5,160,127,721 | 0 | 56,699,995 |
| 2009 | $2,329,704,959 | 0 | 43,430,185 |
| 2010 | $2,821,787,404 | 0 | 48,965,332 |
| 2011 | $4,316,878,514 | 0 | 65,512,636 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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