2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000 $20,000,000 $25,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,345,268 | 1,431,712 | 1,431,712 |
| 2006 | $11,428,165 | 1,479,894 | 1,479,894 |
| 2007 | $15,983,169 | 1,995,313 | 1,995,313 |
| 2008 | $20,429,490 | 1,936,802 | 1,936,802 |
| 2009 | $13,033,573 | 1,236,927 | 1,236,927 |
| 2010 | $15,354,509 | 1,477,976 | 1,477,976 |
| 2011 | $16,324,662 | 1,717,762 | 1,717,762 |
Note: Quantity represents Weight in kilograms
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