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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $193,353,251 | 915,729 | 5,381,693 |
| 2006 | $352,392,828 | 0 | 7,332,682 |
| 2007 | $542,460,844 | 0 | 9,171,081 |
| 2008 | $1,032,076,658 | 0 | 10,896,104 |
| 2009 | $1,064,289,832 | 0 | 13,626,463 |
| 2010 | $1,070,659,057 | 0 | 16,628,059 |
| 2011 | $1,909,858,112 | 0 | 25,995,140 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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