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 | $14,508,000 | 7,811,800 | 7,811,800 |
| 2006 | $14,426,000 | 7,893,900 | 7,893,900 |
| 2007 | $16,486,000 | 6,796,125 | 6,796,125 |
| 2008 | $44,445,000 | 16,025,300 | 16,025,300 |
| 2009 | $13,994,000 | 4,422,100 | 4,422,100 |
| 2010 | $16,089,677 | 6,982,200 | 6,982,200 |
| 2011 | $15,505,364 | 6,513,354 | 6,513,354 |
Note: Quantity represents Weight in kilograms
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