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 | $36,879 | 504 | 504 |
| 2006 | $69,324 | 1,561 | 1,561 |
| 2007 | $58,419 | 1,920 | 1,920 |
| 2008 | $73,819 | 2,329 | 2,329 |
| 2009 | $58,986 | 2,554 | 2,554 |
| 2010 | $67,982 | 1,932 | 1,932 |
| 2011 | $76,414 | 2,144 | 2,144 |
Note: Quantity represents Weight in kilograms
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