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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $514,100 | 21,697 | 8,481 |
| 2006 | $479,800 | 15,697 | 10,147 |
| 2007 | $686,900 | 14,535 | 7,478 |
| 2008 | $570,500 | 13,985 | 9,614 |
| 2009 | $335,000 | 6,701 | 8,250 |
| 2010 | $356,800 | 11,754 | 6,765 |
| 2011 | $442,600 | 15,995 | 9,153 |
Note: Quantity represents Number of pairs
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