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 | $9,549,312 | 10,374,206 | 10,374,206 |
| 2006 | $12,120,446 | 12,753,926 | 12,753,926 |
| 2007 | $19,920,705 | 17,384,959 | 17,384,959 |
| 2008 | $17,527,689 | 15,520,095 | 15,520,095 |
| 2009 | $12,635,941 | 13,109,591 | 13,109,591 |
| 2010 | $11,344,214 | 10,641,179 | 10,641,179 |
| 2011 | $8,908,498 | 8,716,741 | 8,716,741 |
Note: Quantity represents Weight in kilograms
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