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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,109 | 19,714 | 1,686 |
| 2006 | $33,109 | 47,665 | 2,525 |
| 2007 | $67,352 | 78,502 | 4,636 |
| 2008 | $161,399 | 202,099 | 8,151 |
| 2009 | $81,296 | 185,937 | 3,631 |
| 2010 | $10,037 | 19,164 | 452 |
| 2011 | $20,238 | 59,880 | 970 |
Note: Quantity represents Number of pairs
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