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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $185,075 | 7,498 | 22,387 |
| 2006 | $147,174 | 3,416 | 8,355 |
| 2007 | $123,122 | 2,602 | 5,780 |
| 2008 | $88,699 | 1,146 | 3,931 |
| 2009 | $35,525 | 3,796 | 931 |
| 2010 | $43,181 | 4,861 | 829 |
| 2011 | $24,818 | 2,661 | 551 |
Note: Quantity represents Number of pairs
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