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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $28,107 | 913 | 5,797 |
| 2006 | $52,780 | 1,714 | 6,620 |
| 2007 | $29,487 | 856 | 4,470 |
| 2008 | $145,144 | 3,624 | 8,654 |
| 2009 | $64,473 | 1,332 | 8,578 |
| 2010 | $177,610 | 3,843 | 11,158 |
| 2011 | $37,743 | 831 | 2,124 |
Note: Quantity represents Number of pairs
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