2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $59,324 | 2,347 | 3,819 |
| 2006 | $54,429 | 3,528 | 3,504 |
| 2007 | $145,606 | 25,535 | 0 |
| 2008 | $103,774 | 3,732 | 0 |
| 2009 | $93,025 | 11,621 | 0 |
| 2010 | $350,371 | 29,916 | 0 |
| 2011 | $187,161 | 11,297 | 0 |
Note: Quantity represents Number of pairs
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