2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000 $100,000 $150,000 $200,000 $250,000 $300,000 $350,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $41,916 | 1,358 | 2,699 |
| 2006 | $55,394 | 1,359 | 3,566 |
| 2007 | $33,236 | 679 | 0 |
| 2008 | $96,905 | 4,375 | 0 |
| 2009 | $60,716 | 1,475 | 0 |
| 2010 | $192,439 | 32,604 | 0 |
| 2011 | $307,124 | 15,000 | 56,694 |
Note: Quantity represents Number of pairs
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