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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $277,450 | 106,556 | 51,844 |
| 2006 | $376,821 | 136,224 | 67,935 |
| 2007 | $555,660 | 166,961 | 89,751 |
| 2008 | $514,132 | 157,898 | 55,809 |
| 2009 | $599,529 | 171,319 | 59,286 |
| 2010 | $530,167 | 160,274 | 95,459 |
| 2011 | $831,050 | 205,821 | 113,058 |
Note: Quantity represents Number of pairs
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