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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,662,000 | 388,349 | 332,481 |
| 2006 | $9,418,000 | 322,006 | 408,680 |
| 2007 | $11,555,000 | 58,218 | 399,477 |
| 2008 | $11,227,000 | 278,456 | 372,820 |
| 2009 | $7,444,000 | 304,891 | 202,467 |
| 2010 | $2,078,000 | 42,203 | 55,553 |
| 2011 | $2,279,000 | 84,244 | 61,456 |
Note: Quantity represents Number of pairs
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