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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $36,971 | 1,532 | 3,514 |
| 2006 | $198,972 | 6,347 | 8,739 |
| 2007 | $83,222 | 5,049 | 8,001 |
| 2008 | $27,394 | 1,561 | 3,867 |
| 2009 | $30,653 | 451 | 1,035 |
| 2010 | $38,661 | 945 | 1,040 |
| 2011 | $136,276 | 3,676 | 29,935 |
Note: Quantity represents Number of pairs
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