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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $62,600 | 3,548 | 6,639 |
| 2006 | $71,700 | 4,708 | 5,971 |
| 2007 | $306,400 | 11,123 | 14,985 |
| 2008 | $544,200 | 19,475 | 25,638 |
| 2009 | $110,400 | 6,460 | 8,303 |
| 2010 | $303,500 | 15,154 | 25,680 |
| 2011 | $365,100 | 12,363 | 17,487 |
Note: Quantity represents Number of pairs
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