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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $219,232 | 6,392 | 9,513 |
| 2006 | $129,777 | 3,303 | 5,631 |
| 2007 | $169,756 | 5,431 | 5,869 |
| 2008 | $364,474 | 4,929 | 12,103 |
| 2009 | $303,839 | 5,714 | 8,264 |
| 2010 | $296,558 | 4,354 | 7,928 |
| 2011 | $235,527 | 4,778 | 6,351 |
Note: Quantity represents Number of pairs
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