2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000 $100,000 $150,000 $200,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,273 | 15,839 | 15,839 |
| 2006 | $7,977 | 2,331 | 2,331 |
| 2007 | $21,882 | 6,804 | 6,804 |
| 2008 | $154,107 | 59,146 | 59,146 |
| 2009 | $42,672 | 14,744 | 14,744 |
| 2010 | $103,968 | 27,693 | 27,693 |
| 2011 | $76,175 | 22,822 | 22,822 |
Note: Quantity represents Weight in kilograms
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