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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $549,902,879 | 0 | 17,888,373 |
| 2006 | $668,253,394 | 0 | 18,581,841 |
| 2007 | $543,452,319 | 0 | 15,814,874 |
| 2008 | $989,436,091 | 0 | 18,572,955 |
| 2009 | $661,306,334 | 0 | 15,060,089 |
| 2010 | $1,028,285,294 | 0 | 19,061,224 |
| 2011 | $1,104,441,232 | 0 | 18,134,819 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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