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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $17,491 | 2,726 | 934 |
| 2006 | $10,912 | 2,919 | 583 |
| 2007 | $97,629 | 19,820 | 5,369 |
| 2008 | $80,585 | 14,364 | 4,152 |
| 2009 | $36,830 | 36,872 | 1,524 |
| 2010 | $146,879 | 11,474 | 6,575 |
| 2011 | $30,420 | 11,290 | 1,397 |
Note: Quantity represents Number of pairs
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