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 | $2,020,975 | 72,640 | 418,075 |
| 2006 | $2,889,704 | 107,047 | 48,475 |
| 2007 | $4,247,701 | 115,195 | 47,122 |
| 2008 | $2,969,082 | 82,762 | 37,089 |
| 2009 | $2,311,379 | 56,243 | 26,761 |
| 2010 | $2,099,800 | 45,610 | 20,121 |
| 2011 | $2,594,936 | 43,198 | 18,875 |
Note: Quantity represents Number of pairs
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