2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $20,000,000 $40,000,000 $60,000,000 $80,000,000 $100,000,000 $120,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $101,538,518 | 20,373,778 | 8,399 |
| 2006 | $48,068,787 | 8,714,801 | 0 |
| 2007 | $92,465,817 | 18,659,719 | 0 |
| 2008 | $97,967,035 | 18,738,270 | 0 |
| 2009 | $73,241,138 | 10,022,784 | 150 |
| 2010 | $38,369,726 | 6,846,509 | 169 |
| 2011 | $76,412,792 | 13,376,805 | 395 |
Note: Quantity represents Number of items
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