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
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,742,821 | 16,490,400 | 16,490,400 |
| 2006 | $286,265 | 183,700 | 183,700 |
| 2007 | $146,860 | 120,000 | 120,000 |
| 2008 | $912,090 | 717,400 | 717,400 |
| 2009 | $20,956,760 | 24,472,500 | 24,472,500 |
| 2010 | $184,241 | 172,700 | 172,700 |
| 2011 | $12,545,093 | 11,738,000 | 11,738,000 |
Note: Quantity represents Weight in kilograms
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