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
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $54,844,000 | 996,763 | 996,763 |
| 2006 | $45,967,000 | 630,699 | 630,699 |
| 2007 | $39,223,000 | 526,041 | 526,041 |
| 2008 | $38,005,000 | 437,322 | 437,322 |
| 2009 | $22,617,000 | 278,807 | 278,807 |
| 2010 | $30,427,682 | 350,519 | 350,519 |
| 2011 | $29,903,522 | 316,871 | 316,871 |
Note: Quantity represents Weight in kilograms
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