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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $65,911,823 | 981,499,968 | 1,693,521 |
| 2006 | $42,315,942 | 514,235,000 | 0 |
| 2007 | $20,674,419 | 0 | 411,472 |
| 2008 | $55,887,957 | 0 | 1,050,827 |
| 2009 | $32,047,673 | 0 | 383,157 |
| 2010 | $77,047,187 | 0 | 1,349,360 |
| 2011 | $279,745,143 | 0 | 4,631,265 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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