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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $25,807 | 381 | 6,722 |
| 2006 | $56,862 | 1,308 | 3,508 |
| 2007 | $88,185 | 1,911 | 7,817 |
| 2008 | $126,319 | 2,556 | 5,866 |
| 2009 | $39,640 | 823 | 1,039 |
| 2010 | $88,830 | 2,876 | 8,716 |
| 2011 | $88,243 | 4,318 | 18,379 |
Note: Quantity represents Number of pairs
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