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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,758 | 144 | 525 |
| 2006 | $27,633 | 9,028 | 1,872 |
| 2007 | $58,848 | 7,191 | 2,754 |
| 2008 | $203,630 | 26,583 | 10,216 |
| 2009 | $197,773 | 36,294 | 8,175 |
| 2010 | $275,408 | 55,872 | 10,445 |
| 2011 | $82,660 | 17,429 | 4,033 |
Note: Quantity represents Number of pairs
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