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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $11,650 | 732 | 965 |
| 2006 | $70,731 | 4,446 | 51,589 |
| 2007 | $29,764 | 1,771 | 24,971 |
| 2008 | $54,744 | 2,648 | 40,993 |
| 2009 | $41,133 | 1,695 | 21,959 |
| 2010 | $35,509 | 1,552 | 14,521 |
| 2011 | $82,919 | 4,193 | 39,188 |
Note: Quantity represents Number of pairs
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