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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $55,000 | 4,724 | 3,725 |
| 2006 | $68,000 | 5,841 | 4,606 |
| 2007 | $54,000 | 4,922 | 2,212 |
| 2008 | $66,000 | 6,165 | 14,141 |
| 2009 | $36,000 | 3,370 | 1,400 |
| 2010 | $50,000 | 4,769 | 5,961 |
| 2011 | $58,000 | 6,295 | 8,764 |
Note: Quantity represents Number of pairs
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