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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,690 | 1,350 | 1,029 |
| 2006 | $16,079 | 1,056 | 1,089 |
| 2007 | $17,825 | 1,751 | 834 |
| 2008 | $31,971 | 1,679 | 1,604 |
| 2009 | $52,444 | 6,277 | 2,168 |
| 2010 | $23,469 | 1,691 | 890 |
| 2011 | $38,810 | 3,179 | 1,893 |
Note: Quantity represents Number of pairs
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