2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,324,695 | 173,265 | 173,265 |
| 2006 | $2,701,538 | 63,795 | 63,795 |
| 2007 | $7,849,047 | 158,795 | 158,795 |
| 2008 | $5,531,578 | 100,391 | 100,391 |
| 2009 | $8,041,199 | 133,293 | 133,293 |
| 2010 | $8,704,342 | 145,956 | 145,956 |
| 2011 | $13,282,431 | 254,683 | 254,683 |
Note: Quantity represents Weight in kilograms
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