2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000 $400,000 $600,000 $800,000 $1,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $345,296 | 30,316 | 114,660 |
| 2006 | $837,445 | 38,522 | 108,650 |
| 2007 | $525,350 | 0 | 271,348 |
| 2008 | $654,069 | 0 | 229,926 |
| 2009 | $591,514 | 0 | 212,105 |
| 2010 | $427,372 | 10,483 | 82,418 |
| 2011 | $477,410 | 0 | 133,810 |
Note: Quantity represents Number of pairs
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