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 $35,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,229,699 | 4,538,110 | 4,538,110 |
| 2006 | $27,231,942 | 6,932,294 | 6,932,294 |
| 2007 | $22,532,887 | 5,812,804 | 5,812,804 |
| 2008 | $27,320,120 | 6,073,705 | 6,073,705 |
| 2009 | $19,329,378 | 5,102,742 | 5,102,742 |
| 2010 | $21,027,595 | 6,201,093 | 6,201,093 |
| 2011 | $17,938,129 | 5,006,738 | 5,006,738 |
Note: Quantity represents Weight in kilograms
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