2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000,000 $400,000,000 $600,000,000 $800,000,000 $1,000,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $477,975,761 | 39,419,816 | 339,136 |
| 2006 | $818,551,887 | 61,454,899 | 444,879 |
| 2007 | $908,267,162 | 69,550,837 | 488,830 |
| 2008 | $801,214,704 | 47,109,896 | 491,064 |
| 2009 | $791,551,257 | 48,207,371 | 523,130 |
| 2010 | $686,697,936 | 46,008,188 | 474,640 |
| 2011 | $651,704,222 | 45,460,708 | 399,255 |
Note: Quantity represents Number of items
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