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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,992 | 1,105 | 447 |
| 2006 | $6,364 | 826 | 301 |
| 2007 | $18,830 | 3,738 | 2,587 |
| 2008 | $106,170 | 23,844 | 12,231 |
| 2009 | $62,731 | 9,621 | 5,169 |
| 2010 | $23,296 | 2,918 | 1,279 |
| 2011 | $226,218 | 47,540 | 20,223 |
Note: Quantity represents Number of pairs
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