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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,726 | 234 | 84 |
| 2006 | $25,289 | 2,172 | 13,630 |
| 2007 | $96,751 | 10,474 | 3,064 |
| 2008 | $19,323 | 1,682 | 969 |
| 2009 | $65,206 | 7,554 | 828 |
| 2010 | $80,661 | 12,405 | 5,294 |
| 2011 | $246,144 | 24,889 | 14,037 |
Note: Quantity represents Number of pairs
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