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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,500 | 2,174 | 1,256 |
| 2006 | $118,600 | 5,984 | 2,008 |
| 2007 | $512,700 | 23,446 | 7,894 |
| 2008 | $480,000 | 20,962 | 7,141 |
| 2009 | $43,700 | 7,751 | 5,028 |
| 2010 | $196,300 | 24,186 | 14,447 |
| 2011 | $79,400 | 7,698 | 5,749 |
Note: Quantity represents Number of pairs
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