2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000 $200,000 $300,000 $400,000 $500,000 $600,000 $700,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $76,730 | 70,550 | 4,940 |
| 2006 | $180,160 | 196,383 | 11,599 |
| 2007 | $338,650 | 294,977 | 0 |
| 2008 | $303,328 | 333,562 | 0 |
| 2009 | $328,066 | 379,945 | 0 |
| 2010 | $576,933 | 524,299 | 0 |
| 2011 | $194,445 | 59,910 | 0 |
Note: Quantity represents Number of pairs
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