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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,889 | 532 | 7,175 |
| 2006 | $32,301 | 1,504 | 17,980 |
| 2007 | $31,648 | 1,753 | 13,399 |
| 2008 | $205,633 | 7,631 | 71,648 |
| 2009 | $272,023 | 10,986 | 86,066 |
| 2010 | $134,160 | 9,455 | 37,631 |
| 2011 | $86,462 | 3,790 | 24,792 |
Note: Quantity represents Number of pairs
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