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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $104,279 | 11,126 | 4,495 |
| 2006 | $30,923 | 1,311 | 1,482 |
| 2007 | $45,820 | 1,185 | 987 |
| 2008 | $36,894 | 1,274 | 965 |
| 2009 | $81,641 | 5,037 | 3,041 |
| 2010 | $66,750 | 3,451 | 1,812 |
| 2011 | $52,208 | 1,399 | 1,054 |
Note: Quantity represents Number of pairs
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