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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $138,100 | 14,387 | 26,450 |
| 2006 | $723,000 | 37,368 | 127,369 |
| 2007 | $1,213,500 | 57,961 | 217,120 |
| 2008 | $1,637,100 | 73,243 | 267,329 |
| 2009 | $478,100 | 25,120 | 90,674 |
| 2010 | $1,625,000 | 83,153 | 228,646 |
| 2011 | $686,900 | 41,064 | 149,396 |
Note: Quantity represents Number of pairs
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