2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $315,980 | 666,920 | 666,920 |
| 2006 | $285,184 | 512,042 | 512,042 |
| 2007 | $468,154 | 832,713 | 832,713 |
| 2008 | $366,900 | 511,545 | 511,545 |
| 2009 | $175,488 | 382,581 | 382,581 |
| 2010 | $314,305 | 535,118 | 535,118 |
| 2011 | $370,958 | 599,902 | 599,902 |
Note: Quantity represents Weight in kilograms
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