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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,869 | 2,606 | 1,075 |
| 2006 | $23,875 | 939 | 774 |
| 2007 | $24,949 | 1,764 | 1,137 |
| 2008 | $83,247 | 7,221 | 4,435 |
| 2009 | $123,032 | 11,060 | 7,254 |
| 2010 | $166,444 | 11,187 | 10,835 |
| 2011 | $337,187 | 23,757 | 17,155 |
Note: Quantity represents Number of pairs
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