2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000 $20,000,000 $25,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,081,453 | 919,143 | 919,143 |
| 2006 | $5,405,837 | 1,131,019 | 1,131,019 |
| 2007 | $7,277,298 | 1,238,267 | 1,238,267 |
| 2008 | $20,230,967 | 2,550,391 | 2,550,391 |
| 2009 | $19,106,968 | 3,110,651 | 3,110,651 |
| 2010 | $12,816,846 | 3,058,568 | 3,058,568 |
| 2011 | $16,571,784 | 3,265,336 | 3,265,336 |
Note: Quantity represents Weight in kilograms
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