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 $60,000,000 $70,000,000 $80,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $54,763,900 | 35,774,142 | 35,774,142 |
| 2006 | $57,086,000 | 34,791,277 | 34,791,277 |
| 2007 | $63,024,700 | 33,571,028 | 33,571,028 |
| 2008 | $63,398,700 | 30,792,549 | 30,792,549 |
| 2009 | $44,667,700 | 24,408,273 | 24,408,273 |
| 2010 | $47,732,700 | 22,552,336 | 22,552,336 |
| 2011 | $64,524,700 | 23,541,594 | 23,541,594 |
Note: Quantity represents Weight in kilograms
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