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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $67,713 | 11,840 | 8,694 |
| 2006 | $8,816 | 1,541 | 2,109 |
| 2007 | $81,857 | 14,037 | 9,251 |
| 2008 | $102,937 | 17,815 | 26,941 |
| 2009 | $17,835 | 2,472 | 2,727 |
| 2010 | $58,496 | 7,024 | 10,737 |
| 2011 | $118,381 | 18,859 | 28,098 |
Note: Quantity represents Number of pairs
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