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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $716,680,783 | 0 | 11,193,669 |
| 2006 | $723,020,601 | 0 | 12,270,829 |
| 2007 | $858,720,147 | 0 | 14,565,929 |
| 2008 | $991,729,636 | 0 | 16,644,438 |
| 2009 | $1,078,853,779 | 0 | 17,386,125 |
| 2010 | $1,173,191,803 | 0 | 19,059,401 |
| 2011 | $1,237,598,319 | 0 | 19,307,264 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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