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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,952 | 894 | 1,963 |
| 2006 | $10,101 | 23,250 | 1,811 |
| 2007 | $15,611 | 87,550 | 2,263 |
| 2008 | $26,812 | 74,469 | 2,575 |
| 2009 | $7,686 | 25,260 | 720 |
| 2010 | $28,935 | 14,027 | 2,531 |
| 2011 | $6,597 | 7,704 | 689 |
Note: Quantity represents Number of pairs
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