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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $635,187 | 230,024 | 140,702 |
| 2006 | $207,307 | 69,698 | 45,921 |
| 2007 | $104,757 | 18,061 | 13,810 |
| 2008 | $62,905 | 24,123 | 7,717 |
| 2009 | $38,682 | 5,591 | 3,604 |
| 2010 | $102,390 | 20,441 | 9,682 |
| 2011 | $75,611 | 12,872 | 9,568 |
Note: Quantity represents Number of pairs
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