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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $32,103 | 1,588 | 13,609 |
| 2006 | $49,571 | 2,209 | 9,441 |
| 2007 | $89,003 | 3,429 | 18,026 |
| 2008 | $67,815 | 2,151 | 5,609 |
| 2009 | $49,791 | 1,731 | 4,274 |
| 2010 | $80,846 | 3,439 | 4,300 |
| 2011 | $59,654 | 2,077 | 5,529 |
Note: Quantity represents Number of pairs
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