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 | $335,694 | 101,009 | 21,612 |
| 2006 | $41,346 | 3,341 | 2,662 |
| 2007 | $262,361 | 13,531 | 0 |
| 2008 | $848,554 | 27,944 | 0 |
| 2009 | $597,496 | 47,148 | 0 |
| 2010 | $448,075 | 35,370 | 0 |
| 2011 | $857,244 | 23,323 | 0 |
Note: Quantity represents Number of pairs
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