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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $8,292 | 677 | 1,486 |
| 2006 | $10,708 | 874 | 1,919 |
| 2007 | $139,842 | 83,121 | 20,270 |
| 2008 | $129,616 | 0 | 41,380 |
| 2009 | $515,548 | 20,705 | 56,812 |
| 2010 | $207,568 | 172,477 | 67,905 |
| 2011 | $300,611 | 545,950 | 31,375 |
Note: Quantity represents Number of pairs
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