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 | $18,250,015 | 19,483,399 | 19,483,399 |
| 2006 | $23,172,876 | 25,030,385 | 25,030,385 |
| 2007 | $24,497,574 | 22,446,384 | 22,446,384 |
| 2008 | $25,488,807 | 25,029,844 | 25,029,844 |
| 2009 | $27,658,900 | 27,818,556 | 27,818,556 |
| 2010 | $41,761,619 | 25,073,302 | 25,073,302 |
| 2011 | $43,010,005 | 36,222,673 | 36,222,673 |
Note: Quantity represents Weight in kilograms
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