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 $30,000,000 $35,000,000 $40,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $31,931,919 | 90,970 | 90,970 |
| 2006 | $19,533,159 | 60,081 | 60,081 |
| 2007 | $21,999,433 | 71,444 | 71,444 |
| 2008 | $18,772,681 | 64,499 | 64,499 |
| 2009 | $17,586,627 | 86,936 | 86,936 |
| 2010 | $8,130,042 | 36,492 | 36,492 |
| 2011 | $4,872,012 | 17,590 | 17,590 |
Note: Quantity represents Weight in kilograms
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