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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,479,438,902 | 0 | 43,950,880 |
| 2006 | $2,518,429,059 | 0 | 42,621,765 |
| 2007 | $2,713,303,002 | 0 | 43,580,792 |
| 2008 | $3,640,509,386 | 0 | 58,374,890 |
| 2009 | $2,070,609,557 | 0 | 50,138,012 |
| 2010 | $2,071,450,833 | 0 | 45,622,919 |
| 2011 | $2,096,077,391 | 0 | 49,383,027 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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