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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $76,177 | 5,949 | 58,760 |
| 2006 | $112,806 | 8,809 | 47,416 |
| 2007 | $171,458 | 0 | 56,477 |
| 2008 | $252,032 | 17,139 | 71,931 |
| 2009 | $523,888 | 32,530 | 118,582 |
| 2010 | $132,260 | 7,319 | 39,175 |
| 2011 | $227,778 | 12,065 | 79,370 |
Note: Quantity represents Number of pairs
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