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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,617 | 6,517 | 4,180 |
| 2006 | $30,022 | 4,375 | 1,761 |
| 2007 | $73,891 | 14,904 | 10,903 |
| 2008 | $98,700 | 10,574 | 4,239 |
| 2009 | $172,438 | 17,409 | 8,408 |
| 2010 | $41,336 | 7,351 | 3,089 |
| 2011 | $85,458 | 15,333 | 4,688 |
Note: Quantity represents Number of pairs
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