2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $659,000 | 204,642 | 45,952 |
| 2006 | $252,000 | 52,482 | 17,572 |
| 2007 | $319,000 | 151,660 | 25,767 |
| 2008 | $3,879,000 | 0 | 207,463 |
| 2009 | $3,274,000 | 158,426 | 173,590 |
| 2010 | $1,343,000 | 177,818 | 60,535 |
| 2011 | $2,979,000 | 253,230 | 135,499 |
Note: Quantity represents Number of pairs
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