2004 2005 2006 2007 2008 2009 2010 $0 $5,000 $10,000 $15,000 $20,000 $25,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,137 | 21 | 80 |
| 2006 | $741 | 29 | 97 |
| 2007 | $1,546 | 109 | 61 |
| 2008 | $234 | 33 | 60 |
| 2009 | $18,488 | 1,377 | 2,240 |
Note: Quantity represents Number of pairs
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