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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $23,716 | 850 | 1,051 |
| 2006 | $49,756 | 1,643 | 2,868 |
| 2007 | $154,221 | 6,201 | 6,431 |
| 2008 | $179,038 | 5,596 | 5,103 |
| 2009 | $151,582 | 4,927 | 5,140 |
| 2010 | $388,173 | 14,104 | 9,636 |
| 2011 | $382,002 | 9,984 | 9,197 |
Note: Quantity represents Number of pairs
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