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 | $2,478,657 | 35,380 | 72,614 |
| 2006 | $2,792,944 | 36,268 | 71,259 |
| 2007 | $3,207,439 | 36,644 | 58,733 |
| 2008 | $3,828,315 | 34,199 | 62,354 |
| 2009 | $2,331,916 | 34,104 | 46,275 |
| 2010 | $2,809,202 | 33,952 | 51,653 |
| 2011 | $3,457,714 | 25,840 | 50,118 |
Note: Quantity represents Number of pairs
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