2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000 $6,000,000 $7,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,816,590 | 322,402 | 322,402 |
| 2006 | $4,757,873 | 327,058 | 327,058 |
| 2007 | $5,009,290 | 166,590 | 166,590 |
| 2008 | $5,697,999 | 70,153 | 70,153 |
| 2009 | $4,758,745 | 140,852 | 140,852 |
| 2010 | $3,263,714 | 140,674 | 140,674 |
| 2011 | $2,216,117 | 64,718 | 64,718 |
Note: Quantity represents Weight in kilograms
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