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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,326 | 2,948 | 4,059 |
| 2006 | $23,011 | 5,198 | 7,598 |
| 2007 | $38,108 | 5,986 | 7,246 |
| 2008 | $96,098 | 15,045 | 11,789 |
| 2009 | $126,067 | 22,043 | 11,745 |
| 2010 | $8,317 | 1,138 | 786 |
| 2011 | $18,581 | 2,148 | 2,351 |
Note: Quantity represents Number of pairs
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