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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $504,424,706 | 0 | 13,255,273 |
| 2006 | $720,723,001 | 0 | 15,774,756 |
| 2007 | $632,808,064 | 0 | 13,109,461 |
| 2008 | $644,580,218 | 0 | 9,012,917 |
| 2009 | $681,345,645 | 0 | 9,533,797 |
| 2010 | $543,789,477 | 0 | 7,686,509 |
| 2011 | $863,520,837 | 0 | 12,022,049 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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