2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $47,000 | 3,783 | 3,130 |
| 2006 | $13,000 | 236 | 866 |
| 2007 | $8,500,000 | 200 | 557,958 |
| 2008 | $32,000 | 500 | 0 |
| 2009 | $807,000 | 45,723 | 0 |
| 2010 | $38,000 | 9,025 | 991 |
| 2011 | $39,000 | 5,850 | 0 |
Note: Quantity represents Number of pairs
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