2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $500,000 $1,000,000 $1,500,000 $2,000,000 $2,500,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,789 | 8,702 | 15,699 |
| 2006 | $212,077 | 21,133 | 11,327 |
| 2007 | $125,307 | 25,405 | 6,891 |
| 2008 | $1,787,152 | 65,352 | 1,033,119 |
| 2009 | $1,885,100 | 56,815 | 78,020 |
| 2010 | $702,858 | 240,418 | 633,529 |
| 2011 | $1,948,809 | 442,114 | 1,095,998 |
Note: Quantity represents Number of pairs
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