2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $10,000,000 $20,000,000 $30,000,000 $40,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $15,511,895 | 62,251,879 | 62,251,879 |
| 2006 | $24,069,381 | 71,184,167 | 71,184,167 |
| 2007 | $30,534,929 | 75,443,580 | 75,443,580 |
| 2008 | $22,601,986 | 52,398,599 | 52,398,599 |
| 2009 | $10,408,955 | 51,575,800 | 51,575,800 |
| 2010 | $36,097,693 | 124,951,678 | 124,951,678 |
| 2011 | $35,483,714 | 94,725,325 | 94,725,325 |
Note: Quantity represents Weight in kilograms
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