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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,957 | 1,860 | 1,284 |
| 2006 | $20,661 | 1,868 | 1,147 |
| 2007 | $30,208 | 3,665 | 1,413 |
| 2008 | $59,454 | 10,997 | 2,983 |
| 2009 | $37,713 | 4,452 | 1,559 |
| 2010 | $25,607 | 4,319 | 971 |
| 2011 | $50,966 | 4,539 | 2,486 |
Note: Quantity represents Number of pairs
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