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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $78,787 | 9,617 | 10,496 |
| 2006 | $115,491 | 433 | 14,936 |
| 2007 | $107,721 | 18,279 | 11,507 |
| 2008 | $121,919 | 17,826 | 15,218 |
| 2009 | $225,814 | 26,283 | 20,334 |
| 2010 | $377,408 | 35,290 | 28,808 |
| 2011 | $340,148 | 39,273 | 30,433 |
Note: Quantity represents Number of pairs
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