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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $102,967 | 3,160 | 13,528 |
| 2006 | $172,974 | 5,122 | 11,556 |
| 2007 | $188,793 | 4,529 | 7,161 |
| 2008 | $82,498 | 1,272 | 3,445 |
| 2009 | $34,389 | 593 | 1,215 |
| 2010 | $36,970 | 677 | 1,435 |
| 2011 | $15,658 | 193 | 430 |
Note: Quantity represents Number of pairs
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