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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $267,589 | 15,853 | 12,159 |
| 2006 | $224,464 | 11,189 | 8,852 |
| 2007 | $237,675 | 10,444 | 11,157 |
| 2008 | $438,531 | 9,554 | 8,334 |
| 2009 | $302,205 | 6,611 | 6,331 |
| 2010 | $359,143 | 5,791 | 5,370 |
| 2011 | $290,926 | 5,352 | 5,409 |
Note: Quantity represents Number of pairs
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