2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000,000 $100,000,000 $150,000,000 $200,000,000 $250,000,000 $300,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $118,735,000 | 36,041,807 | 36,041,807 |
| 2006 | $168,796,000 | 47,490,051 | 47,490,051 |
| 2007 | $197,624,000 | 51,282,300 | 51,282,300 |
| 2008 | $225,000,000 | 50,652,850 | 50,652,850 |
| 2009 | $169,232,000 | 42,005,493 | 42,005,493 |
| 2010 | $200,052,334 | 49,432,127 | 49,432,127 |
| 2011 | $245,220,715 | 52,063,586 | 52,063,586 |
Note: Quantity represents Weight in kilograms
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