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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,249 | 322 | 979 |
| 2006 | $29,015 | 1,154 | 3,605 |
| 2007 | $252,283 | 9,181 | 23,317 |
| 2008 | $75,590 | 642 | 1,624 |
| 2009 | $38,389 | 563 | 1,775 |
| 2010 | $100,815 | 2,694 | 6,609 |
| 2011 | $186,736 | 5,964 | 18,137 |
Note: Quantity represents Number of pairs
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