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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,575,481 | 139,414 | 220,376 |
| 2006 | $4,565,412 | 138,051 | 207,709 |
| 2007 | $2,364,426 | 80,649 | 108,759 |
| 2008 | $1,860,308 | 68,606 | 95,347 |
| 2009 | $3,198,196 | 195,669 | 180,103 |
| 2010 | $4,565,504 | 215,073 | 260,693 |
| 2011 | $5,264,869 | 244,034 | 258,135 |
Note: Quantity represents Number of pairs
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