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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,568,246,682 | 0 | 42,332,420 |
| 2006 | $2,112,639,708 | 0 | 39,703,480 |
| 2007 | $2,888,120,588 | 0 | 49,321,970 |
| 2008 | $3,576,074,676 | 0 | 71,650,068 |
| 2009 | $2,093,449,763 | 0 | 51,722,629 |
| 2010 | $1,964,615,145 | 0 | 43,798,653 |
| 2011 | $2,051,411,657 | 0 | 51,076,857 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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