2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $20,000 $40,000 $60,000 $80,000 $100,000 $120,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $77,068 | 5,844 | 4,962 |
| 2006 | $70,352 | 8,888 | 4,529 |
| 2007 | $88,494 | 12,475 | 0 |
| 2008 | $108,309 | 8,146 | 0 |
| 2009 | $29,064 | 2,340 | 0 |
| 2010 | $70,340 | 8,712 | 0 |
| 2011 | $69,086 | 6,682 | 0 |
Note: Quantity represents Number of pairs
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