2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,378,220 | 109,398 | 96,088 |
| 2006 | $3,341,971 | 153,731 | 94,608 |
| 2007 | $3,883,880 | 0 | 84,595 |
| 2008 | $4,269,413 | 0 | 81,365 |
| 2009 | $2,029,030 | 0 | 33,648 |
| 2010 | $3,693,864 | 90,608 | 109,350 |
| 2011 | $3,578,874 | 0 | 80,684 |
Note: Quantity represents Number of pairs
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