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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,753,400 | 1,543,033 | 2,683,069 |
| 2006 | $5,444,900 | 1,787,594 | 2,870,753 |
| 2007 | $2,064,100 | 594,891 | 991,586 |
| 2008 | $17,300 | 800 | 2,069 |
| 2009 | $592,200 | 59,617 | 96,750 |
| 2010 | $1,141,100 | 113,033 | 182,722 |
| 2011 | $2,077,100 | 155,814 | 197,242 |
Note: Quantity represents Number of pairs
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