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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $11,620,171 | 0 | 156,247 |
| 2006 | $46,093,648 | 0 | 2,420,447 |
| 2007 | $27,913,231 | 0 | 358,645 |
| 2008 | $43,527,889 | 0 | 372,745 |
| 2009 | $16,489,298 | 0 | 327,684 |
| 2010 | $24,113,191 | 0 | 440,994 |
| 2011 | $32,857,336 | 0 | 599,170 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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