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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $568,657,198 | 0 | 14,610,925 |
| 2006 | $879,257,752 | 0 | 18,207,411 |
| 2007 | $515,215,130 | 0 | 15,263,847 |
| 2008 | $915,027,694 | 0 | 16,396,074 |
| 2009 | $672,090,048 | 0 | 15,279,687 |
| 2010 | $913,155,407 | 0 | 15,481,803 |
| 2011 | $1,102,433,338 | 0 | 17,606,444 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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