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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $320,784 | 9,453 | 9,340 |
| 2006 | $61,584 | 1,229 | 856 |
| 2007 | $39,338 | 699 | 1,633 |
| 2008 | $74,756 | 414 | 529 |
| 2009 | $1,141,052 | 31,290 | 25,477 |
| 2010 | $191,389 | 4,414 | 4,647 |
| 2011 | $416,900 | 9,101 | 8,667 |
Note: Quantity represents Number of pairs
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