2004 2005 2006 2007 2008 2009 2011 2012 $0 $20,000 $40,000 $60,000 $80,000 $100,000 $120,000 $140,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $41,626 | 9,081 | 20,891 |
| 2006 | $64,230 | 36,543 | 57,616 |
| 2007 | $110,353 | 41,186 | 87,324 |
| 2008 | $114,768 | 29,024 | 67,346 |
| 2009 | $100,459 | 20,925 | 71,512 |
| 2011 | $39,483 | 8,179 | 19,290 |
Note: Quantity represents Number of pairs
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