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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,370 | 1,573 | 2,597 |
| 2006 | $17,162 | 4,669 | 2,541 |
| 2007 | $21,183 | 5,455 | 2,833 |
| 2008 | $15,452 | 3,663 | 1,677 |
| 2009 | $17,762 | 2,746 | 1,756 |
| 2010 | $17,380 | 2,867 | 1,660 |
| 2011 | $22,701 | 3,645 | 2,297 |
Note: Quantity represents Number of pairs
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