2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000 $700,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $284,205 | 37,106 | 33,755 |
| 2006 | $476,118 | 21,901 | 119,836 |
| 2007 | $600,021 | 28,685 | 43,560 |
| 2008 | $368,681 | 13,584 | 19,447 |
| 2009 | $166,467 | 7,776 | 14,528 |
| 2010 | $303,152 | 23,968 | 49,654 |
| 2011 | $382,362 | 14,676 | 50,128 |
Note: Quantity represents Number of pairs
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