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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $294,112 | 17,259 | 16,697 |
| 2006 | $231,595 | 7,427 | 13,148 |
| 2007 | $224,866 | 9,006 | 10,557 |
| 2008 | $390,691 | 17,371 | 16,561 |
| 2009 | $470,665 | 20,898 | 19,186 |
| 2010 | $598,531 | 21,430 | 24,675 |
| 2011 | $502,947 | 24,270 | 27,592 |
Note: Quantity represents Number of pairs
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