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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $17,469 | 1,244 | 1,852 |
| 2006 | $36,203 | 5,313 | 5,323 |
| 2007 | $45,571 | 14,396 | 2,818 |
| 2008 | $49,243 | 6,420 | 14,499 |
| 2009 | $40,410 | 9,426 | 13,790 |
| 2010 | $27,650 | 3,388 | 2,750 |
| 2011 | $28,866 | 3,585 | 1,603 |
Note: Quantity represents Number of pairs
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