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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,212 | 724 | 5,638 |
| 2006 | $16,226 | 1,968 | 1,949 |
| 2007 | $53,535 | 10 | 29,223 |
| 2008 | $115,524 | 17,793 | 44,336 |
| 2009 | $140,757 | 23,969 | 63,746 |
| 2010 | $27,066 | 4,203 | 14,198 |
| 2011 | $158,751 | 16,623 | 46,206 |
Note: Quantity represents Number of pairs
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