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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $11,945 | 388 | 750 |
| 2006 | $40,292 | 1,308 | 3,000 |
| 2007 | $11,385 | 331 | 3,205 |
| 2008 | $92,326 | 2,305 | 4,671 |
| 2009 | $541,487 | 11,188 | 25,135 |
| 2010 | $144,447 | 3,126 | 3,323 |
| 2011 | $205,078 | 4,513 | 4,048 |
Note: Quantity represents Number of pairs
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