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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $187,115 | 33,358 | 9,214 |
| 2006 | $65,118 | 6,255 | 3,206 |
| 2007 | $137,509 | 17,896 | 6,325 |
| 2008 | $80,408 | 3,433 | 3,390 |
| 2009 | $113,858 | 5,970 | 4,127 |
| 2010 | $13,075 | 763 | 466 |
| 2011 | $50,170 | 1,888 | 1,781 |
Note: Quantity represents Number of pairs
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