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 $60,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,875,000 | 74,171,900 | 74,171,900 |
| 2006 | $32,508,000 | 88,658,300 | 88,658,300 |
| 2007 | $44,596,000 | 101,794,600 | 101,794,600 |
| 2008 | $52,787,000 | 107,668,000 | 107,668,000 |
| 2009 | $18,192,000 | 73,471,939 | 73,471,939 |
| 2010 | $25,470,000 | 79,417,600 | 79,417,600 |
| 2011 | $35,809,000 | 91,255,100 | 91,255,100 |
Note: Quantity represents Weight in kilograms
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