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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,859,208 | 0 | 62,576 |
| 2006 | $4,855,437 | 0 | 0 |
| 2007 | $8,695,922 | 0 | 260,723 |
| 2008 | $10,869,838 | 0 | 203,075 |
| 2009 | $13,172,369 | 0 | 8,406 |
| 2010 | $12,505,028 | 0 | 228,194 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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