2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $20,000 $40,000 $60,000 $80,000 $100,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,821 | 14,512 | 14,512 |
| 2006 | $23,998 | 11,122 | 11,122 |
| 2007 | $28,772 | 23,496 | 23,496 |
| 2008 | $50,771 | 21,564 | 21,564 |
| 2009 | $64,544 | 27,229 | 27,229 |
| 2010 | $85,645 | 21,562 | 21,562 |
| 2011 | $76,271 | 16,006 | 16,006 |
Note: Quantity represents Weight in kilograms
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