2004 2005 2006 2007 2009 2010 2011 2012 $0 $20,000 $40,000 $60,000 $80,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,407 | 944 | 670 |
| 2006 | $9,446 | 415 | 608 |
| 2007 | $8,776 | 454 | 0 |
| 2009 | $70,055 | 7,327 | 0 |
| 2010 | $6,649 | 507 | 214 |
| 2011 | $25,969 | 2,143 | 940 |
Note: Quantity represents Number of pairs
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