2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000 $100,000 $150,000 $200,000 $250,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $177,839 | 10,385 | 41,016 |
| 2006 | $178,327 | 10,674 | 46,241 |
| 2007 | $142,672 | 4,445 | 21,855 |
| 2008 | $190,489 | 8,579 | 34,129 |
| 2009 | $140,508 | 8,520 | 34,220 |
| 2010 | $110,765 | 1,622 | 6,095 |
| 2011 | $188,877 | 3,024 | 4,916 |
Note: Quantity represents Number of pairs
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