2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000 $400,000 $600,000 $800,000 $1,000,000 $1,200,000 $1,400,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $871,100 | 99,510 | 69,875 |
| 2006 | $727,131 | 95,719 | 58,327 |
| 2007 | $677,447 | 72,936 | 34,212 |
| 2008 | $879,862 | 89,829 | 32,440 |
| 2009 | $932,494 | 94,061 | 30,740 |
| 2010 | $1,215,341 | 118,078 | 37,890 |
| 2011 | $1,233,933 | 107,229 | 41,291 |
Note: Quantity represents Number of pairs
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