2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000 $400,000 $600,000 $800,000 $1,000,000 $1,200,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $989,720 | 450,406 | 450,406 |
| 2006 | $703,594 | 545,416 | 545,416 |
| 2007 | $941,770 | 443,005 | 443,005 |
| 2008 | $607,228 | 503,136 | 503,136 |
| 2009 | $686,809 | 339,096 | 339,096 |
| 2010 | $817,554 | 213,479 | 213,479 |
| 2011 | $917,124 | 249,442 | 249,442 |
Note: Quantity represents Weight in kilograms
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