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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $178,211,474 | 0 | 9,001,143 |
| 2006 | $281,744,580 | 0 | 9,855,947 |
| 2007 | $386,441,925 | 0 | 9,719,292 |
| 2008 | $468,852,820 | 0 | 7,852,805 |
| 2009 | $229,317,760 | 0 | 4,294,034 |
| 2010 | $200,336,679 | 0 | 4,078,291 |
| 2011 | $430,490,261 | 0 | 6,322,298 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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