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 | $113,355 | 2,166 | 2,166 |
| 2006 | $111,032 | 2,515 | 2,515 |
| 2007 | $14,304,383 | 35,764,998 | 35,764,998 |
| 2008 | $24,117,997 | 49,664,808 | 49,664,808 |
| 2009 | $24,258,304 | 51,420,072 | 51,420,072 |
| 2010 | $34,110,626 | 74,001,434 | 74,001,434 |
| 2011 | $37,699,772 | 71,679,329 | 71,679,329 |
Note: Quantity represents Weight in kilograms
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