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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,542 | 9,152 | 1,274 |
| 2006 | $8,698 | 5,100 | 762 |
| 2007 | $32,917 | 22,914 | 4,671 |
| 2008 | $106,250 | 59,798 | 7,820 |
| 2009 | $14,377 | 54,477 | 941 |
| 2010 | $88,257 | 7,309 | 5,775 |
| 2011 | $4,811 | 8,850 | 306 |
Note: Quantity represents Number of pairs
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