2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000 $700,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $174,270 | 969,309 | 969,309 |
| 2006 | $127,306 | 868,808 | 868,808 |
| 2007 | $85,791 | 532,128 | 532,128 |
| 2008 | $225,031 | 854,015 | 854,015 |
| 2009 | $94,670 | 561,327 | 561,327 |
| 2010 | $549,460 | 5,084,244 | 5,084,244 |
| 2011 | $327,321 | 1,175,990 | 1,175,990 |
Note: Quantity represents Weight in kilograms
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