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 | $39,462,627 | 4,839,978 | 4,839,978 |
| 2006 | $43,213,649 | 5,362,253 | 5,362,253 |
| 2007 | $34,784,570 | 4,021,164 | 4,021,164 |
| 2008 | $33,154,681 | 3,287,991 | 3,287,991 |
| 2009 | $24,172,663 | 1,941,562 | 1,941,562 |
| 2010 | $30,364,815 | 2,177,344 | 2,177,344 |
| 2011 | $36,321,325 | 2,602,559 | 2,602,559 |
Note: Quantity represents Weight in kilograms
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