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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,000 | 400 | 1,670 |
| 2006 | $22,000 | 2,600 | 12,246 |
| 2007 | $24,000 | 5,200 | 10,161 |
| 2008 | $64,000 | 6,702 | 22,299 |
| 2009 | $47,000 | 9,700 | 14,870 |
| 2010 | $338,000 | 104,500 | 94,806 |
| 2011 | $577,000 | 94,864 | 165,450 |
Note: Quantity represents Number of pairs
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