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 | $34,151,000 | 96,188,733 | 96,188,733 |
| 2006 | $34,041,000 | 99,224,904 | 99,224,904 |
| 2007 | $39,320,000 | 111,993,641 | 111,993,641 |
| 2008 | $45,611,000 | 112,014,800 | 112,014,800 |
| 2009 | $25,741,000 | 58,013,552 | 58,013,552 |
| 2010 | $30,945,763 | 79,315,288 | 79,315,288 |
| 2011 | $35,921,611 | 89,059,370 | 89,059,370 |
Note: Quantity represents Weight in kilograms
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