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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $32,800 | 2,817 | 2,222 |
| 2006 | $85,977 | 7,385 | 5,824 |
| 2007 | $117,461 | 10,706 | 5,496 |
| 2008 | $147,361 | 13,765 | 7,393 |
| 2009 | $124,796 | 11,681 | 5,158 |
| 2010 | $249,960 | 23,843 | 9,480 |
| 2011 | $322,000 | 67,494 | 36,724 |
Note: Quantity represents Number of pairs
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