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 | $7,403,060 | 963,532 | 963,532 |
| 2006 | $11,135,805 | 2,113,172 | 2,113,172 |
| 2007 | $11,199,638 | 1,009,758 | 1,009,758 |
| 2008 | $11,071,484 | 754,571 | 754,571 |
| 2009 | $11,278,643 | 924,727 | 924,727 |
| 2010 | $13,951,025 | 907,686 | 907,686 |
| 2011 | $18,200,496 | 1,236,005 | 1,236,005 |
Note: Quantity represents Weight in kilograms
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