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 | $13,460,543 | 39,237,434 | 39,237,434 |
| 2006 | $17,941,735 | 44,130,371 | 44,130,371 |
| 2007 | $20,154,205 | 43,812,923 | 43,812,923 |
| 2008 | $26,377,997 | 37,707,080 | 37,707,080 |
| 2009 | $41,668,041 | 36,963,584 | 36,963,584 |
| 2010 | $39,168,173 | 33,339,060 | 33,339,060 |
| 2011 | $9,429,329 | 8,912,988 | 8,912,988 |
Note: Quantity represents Weight in kilograms
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