2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000 $100,000 $150,000 $200,000 $250,000 $300,000 $350,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $178,311 | 102,333 | 248,467 |
| 2006 | $176,902 | 16,781 | 24,518 |
| 2007 | $274,953 | 9,817 | 9,759 |
| 2008 | $198,747 | 356,711 | 250,908 |
| 2009 | $7,849 | 200 | 436 |
| 2010 | $35,042 | 8,395 | 16,506 |
| 2011 | $7,191 | 347 | 565 |
Note: Quantity represents Number of pairs
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