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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,893 | 419 | 629 |
| 2006 | $51,468 | 1,554 | 5,583 |
| 2007 | $116,030 | 14,883 | 3,551 |
| 2008 | $269,668 | 29,834 | 8,955 |
| 2009 | $276,189 | 69,610 | 91,623 |
| 2010 | $583,966 | 107,638 | 31,472 |
| 2011 | $58,632 | 16,833 | 6,654 |
Note: Quantity represents Number of pairs
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