2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $20,000 $40,000 $60,000 $80,000 $100,000 $120,000 $140,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,600 | 1,047 | 1,562 |
| 2006 | $116,200 | 4,281 | 4,314 |
| 2007 | $66,100 | 1,242 | 2,542 |
| 2008 | $123,200 | 7,417 | 9,250 |
| 2009 | $70,700 | 426 | 892 |
| 2010 | $110,700 | 2,716 | 5,561 |
| 2011 | $103,800 | 4,206 | 29,735 |
Note: Quantity represents Number of pairs
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