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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,996 | 253 | 745 |
| 2006 | $45,590 | 12,659 | 19,616 |
| 2007 | $121,112 | 14,770 | 15,432 |
| 2008 | $204,730 | 30,007 | 10,271 |
| 2009 | $219,402 | 35,472 | 9,069 |
| 2010 | $195,662 | 33,855 | 7,420 |
| 2011 | $322,765 | 44,866 | 15,746 |
Note: Quantity represents Number of pairs
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