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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $36,167 | 9,623 | 1,161 |
| 2006 | $19,474 | 1,384 | 625 |
| 2007 | $71,256 | 14,463 | 12,508 |
| 2008 | $140,441 | 20,726 | 25,925 |
| 2009 | $82,809 | 111,276 | 145,433 |
| 2010 | $2,125 | 345 | 206 |
| 2011 | $10,369 | 541 | 607 |
Note: Quantity represents Number of pairs
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