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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $312,900 | 57,383 | 31,218 |
| 2006 | $285,400 | 46,791 | 29,746 |
| 2007 | $437,700 | 59,678 | 38,342 |
| 2008 | $436,900 | 56,753 | 36,702 |
| 2009 | $358,100 | 51,008 | 32,821 |
| 2010 | $422,700 | 68,348 | 44,767 |
| 2011 | $404,000 | 59,445 | 38,198 |
Note: Quantity represents Number of pairs
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