2004 2005 2006 2007 2008 2009 2010 2011 $0 $10,000 $20,000 $30,000 $40,000 $50,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $40,269 | 1,710 | 2,592 |
| 2006 | $12,602 | 3,811 | 457 |
| 2007 | $32,829 | 12,625 | 0 |
| 2008 | $13,294 | 5,941 | 0 |
| 2009 | $42,352 | 17,651 | 0 |
| 2010 | $20,207 | 4,154 | 0 |
Note: Quantity represents Number of pairs
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