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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $105,143 | 7,182 | 21,751 |
| 2006 | $60,009 | 3,696 | 4,484 |
| 2007 | $79,017 | 4,116 | 3,105 |
| 2008 | $281,614 | 12,809 | 0 |
| 2009 | $148,565 | 6,286 | 4,946 |
| 2010 | $231,364 | 10,246 | 8,036 |
| 2011 | $204,443 | 11,485 | 7,124 |
Note: Quantity represents Number of pairs
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