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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $53,210 | 10,463 | 2,822 |
| 2006 | $39,972 | 16,997 | 2,120 |
| 2007 | $67,563 | 17,974 | 9,703 |
| 2008 | $57,408 | 26,108 | 10,370 |
| 2009 | $36,997 | 14,557 | 8,494 |
| 2010 | $65,181 | 44,253 | 31,544 |
| 2011 | $70,512 | 32,715 | 18,630 |
Note: Quantity represents Number of pairs
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