2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $10,000,000 $20,000,000 $30,000,000 $40,000,000 $50,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $11,441,788 | 56,538,150 | 56,538,150 |
| 2006 | $13,159,145 | 61,236,850 | 61,236,850 |
| 2007 | $17,174,600 | 71,066,236 | 71,066,236 |
| 2008 | $33,522,245 | 59,323,200 | 59,323,200 |
| 2009 | $23,618,685 | 0 | 0 |
| 2010 | $26,500,617 | 59,330,770 | 59,330,770 |
| 2011 | $39,363,376 | 76,827,175 | 76,827,175 |
Note: Quantity represents Weight in kilograms
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