2004 2005 2006 2007 2008 2009 2010 2011 $0 $500 $1,000 $1,500 $2,000 $2,500 $3,000 $3,500
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $599 | 573 | 39 |
| 2006 | $1,379 | 1,346 | 89 |
| 2007 | $1,509 | 1,453 | 44 |
| 2008 | $1,004 | 145 | 0 |
| 2009 | $2,873 | 1,911 | 0 |
| 2010 | $883 | 1,078 | 0 |
Note: Quantity represents Number of pairs
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