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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $21,073 | 10,198 | 914 |
| 2006 | $43,535 | 20,013 | 1,889 |
| 2007 | $66,893 | 53,116 | 2,313 |
| 2008 | $93,388 | 83,127 | 3,101 |
| 2009 | $47,742 | 31,374 | 1,299 |
| 2010 | $12,026 | 15,490 | 322 |
| 2011 | $177,026 | 40,821 | 4,774 |
Note: Quantity represents Number of pairs
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