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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $290,000 | 16,576 | 22,453 |
| 2006 | $71,000 | 4,058 | 5,497 |
| 2007 | $44,000 | 2,772 | 1,127 |
| 2008 | $265,000 | 13,434 | 19,353 |
| 2009 | $39,000 | 1,956 | 0 |
| 2010 | $491,000 | 17,883 | 25,601 |
| 2011 | $805,000 | 29,704 | 40,369 |
Note: Quantity represents Number of pairs
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