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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $21,548 | 20,172 | 1,643 |
| 2006 | $11,218 | 15,497 | 855 |
| 2007 | $13,206 | 30,000 | 105,903 |
| 2008 | $64,119 | 13,764 | 16,608 |
| 2009 | $3,403 | 179 | 225 |
| 2010 | $12,282 | 2,406 | 3,900 |
| 2011 | $360,147 | 441,744 | 641,373 |
Note: Quantity represents Number of pairs
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