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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,771 | 105 | 342 |
| 2006 | $12,379 | 467 | 7,108 |
| 2007 | $71,199 | 2,569 | 19,406 |
| 2008 | $682,638 | 23,900 | 27,099 |
| 2009 | $840,869 | 26,350 | 42,963 |
| 2010 | $756,460 | 23,239 | 29,871 |
| 2011 | $538,861 | 16,072 | 16,582 |
Note: Quantity represents Number of pairs
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