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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,321 | 1,629 | 1,126 |
| 2006 | $26,910 | 3,264 | 1,721 |
| 2007 | $35,431 | 0 | 1,473 |
| 2008 | $12,153 | 1,365 | 482 |
| 2009 | $20,100 | 2,017 | 5,680 |
| 2010 | $87,748 | 8,934 | 19,033 |
| 2011 | $165,914 | 15,366 | 22,230 |
Note: Quantity represents Number of pairs
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