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
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,721,168 | 1,190,260 | 1,190,260 |
| 2006 | $12,442,212 | 1,461,205 | 1,461,205 |
| 2007 | $14,136,003 | 1,706,337 | 1,706,337 |
| 2008 | $19,005,972 | 1,590,500 | 1,590,500 |
| 2009 | $11,254,490 | 943,437 | 943,437 |
| 2010 | $13,546,336 | 1,291,519 | 1,291,519 |
| 2011 | $20,196,201 | 1,840,988 | 1,840,988 |
Note: Quantity represents Weight in kilograms
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