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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,450 | 1,880 | 2,477 |
| 2006 | $24,250 | 5,302 | 13,499 |
| 2007 | $82,115 | 18,347 | 34,764 |
| 2008 | $118,612 | 32,852 | 41,328 |
| 2009 | $168,747 | 32,607 | 53,390 |
| 2010 | $186,239 | 34,395 | 52,238 |
| 2011 | $89,918 | 24,832 | 25,783 |
Note: Quantity represents Number of pairs
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