2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $10,000 $20,000 $30,000 $40,000 $50,000 $60,000 $70,000 $80,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,532 | 2,075 | 4,015 |
| 2006 | $14,211 | 13,704 | 15,512 |
| 2007 | $18,494 | 26,535 | 36,957 |
| 2008 | $44,428 | 81,724 | 0 |
| 2009 | $23,242 | 9,370 | 0 |
| 2010 | $64,960 | 81,463 | 77,455 |
| 2011 | $19,281 | 27,586 | 71,748 |
Note: Quantity represents Number of pairs
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