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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $54,143 | 2,045 | 2,100 |
| 2006 | $96,262 | 3,635 | 3,733 |
| 2007 | $56,240 | 2,029 | 2,041 |
| 2008 | $16,878 | 591 | 562 |
| 2009 | $214,472 | 6,721 | 6,250 |
| 2010 | $183,338 | 5,632 | 5,633 |
| 2011 | $59,000 | 86,950 | 49,726 |
Note: Quantity represents Number of pairs
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