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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $81,725 | 16,069 | 6,107 |
| 2006 | $70,519 | 5,749 | 5,269 |
| 2007 | $153,471 | 18,249 | 6,030 |
| 2008 | $227,427 | 17,399 | 0 |
| 2009 | $221,818 | 17,840 | 7,385 |
| 2010 | $199,928 | 19,878 | 6,945 |
| 2011 | $249,110 | 28,791 | 8,681 |
Note: Quantity represents Number of pairs
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