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 | $30,081,441 | 18,823,120 | 18,823,120 |
| 2006 | $31,416,965 | 11,971,474 | 11,971,474 |
| 2007 | $33,367,188 | 13,450,446 | 13,450,446 |
| 2008 | $44,137,577 | 17,061,456 | 17,061,456 |
| 2009 | $38,996,838 | 17,644,624 | 17,644,624 |
| 2010 | $44,405,531 | 22,874,494 | 22,874,494 |
| 2011 | $43,177,515 | 19,295,856 | 19,295,856 |
Note: Quantity represents Weight in kilograms
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