2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000 $700,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $190,777 | 8,776 | 39,637 |
| 2006 | $238,416 | 10,967 | 129,663 |
| 2007 | $115,608 | 0 | 19,928 |
| 2008 | $424,247 | 0 | 69,467 |
| 2009 | $611,944 | 0 | 37,309 |
| 2010 | $453,931 | 11,135 | 11,975 |
| 2011 | $167,110 | 0 | 0 |
Note: Quantity represents Number of pairs
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