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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $56,346 | 1,189 | 1,678 |
| 2006 | $131,394 | 2,915 | 4,268 |
| 2007 | $31,105 | 805 | 5,026 |
| 2008 | $130,325 | 1,924 | 8,019 |
| 2009 | $17,309 | 203 | 605 |
| 2010 | $65,750 | 1,768 | 2,965 |
| 2011 | $560,880 | 16,413 | 31,519 |
Note: Quantity represents Number of pairs
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