2004 2005 2006 2007 2008 2009 2010 2011 $0 $50,000 $100,000 $150,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $16,817 | 1,197 | 1,083 |
| 2006 | $15,202 | 2,262 | 979 |
| 2007 | $61,756 | 21,774 | 0 |
| 2008 | $131,459 | 6,377 | 0 |
| 2009 | $28,700 | 6,130 | 0 |
| 2010 | $125,467 | 19,949 | 0 |
Note: Quantity represents Number of pairs
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