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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,989 | 35,468 | 65,619 |
| 2006 | $35,789 | 8,387 | 1,553 |
| 2007 | $1,108 | 1,688 | 38 |
| 2008 | $265,438 | 6,603 | 153,244 |
| 2009 | $699,057 | 13,956 | 19,013 |
| 2010 | $262,290 | 93,909 | 218,191 |
| 2011 | $457,884 | 106,016 | 330,769 |
Note: Quantity represents Number of pairs
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