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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $57,136,136 | 0 | 2,370,779 |
| 2006 | $56,121,148 | 0 | 2,010,079 |
| 2007 | $23,409,047 | 0 | 773,660 |
| 2008 | $10,520,669 | 0 | 266,543 |
| 2009 | $5,126,300 | 0 | 133,906 |
| 2010 | $3,684,017 | 0 | 83,924 |
| 2011 | $7,275,697 | 0 | 169,726 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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