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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,983 | 871 | 1,524 |
| 2006 | $52,546 | 9,188 | 3,657 |
| 2007 | $60,659 | 10,402 | 9,696 |
| 2008 | $88,818 | 15,371 | 2,502 |
| 2009 | $533,264 | 73,915 | 38,575 |
| 2010 | $453,266 | 54,426 | 8,889 |
| 2011 | $181,809 | 28,963 | 23,007 |
Note: Quantity represents Number of pairs
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