2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $258,640 | 7,611 | 7,611 |
| 2006 | $138,052 | 4,070 | 4,070 |
| 2007 | $79,465 | 2,228 | 2,228 |
| 2008 | $333,282 | 8,353 | 8,353 |
| 2009 | $14,728 | 732 | 732 |
| 2010 | $14,886 | 792 | 792 |
| 2011 | $6,559 | 295 | 295 |
Note: Quantity represents Weight in kilograms
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