2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $500,000 $1,000,000 $1,500,000 $2,000,000 $2,500,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $702,000 | 27,529 | 45,194 |
| 2006 | $722,203 | 19,281 | 46,495 |
| 2007 | $589,720 | 15,556 | 0 |
| 2008 | $795,321 | 19,637 | 0 |
| 2009 | $1,080,106 | 33,964 | 0 |
| 2010 | $1,325,591 | 20,938 | 0 |
| 2011 | $1,901,830 | 17,760 | 0 |
Note: Quantity represents Number of pairs
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