2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $2,000,000 $4,000,000 $6,000,000 $8,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,246,872 | 241,356 | 294,781 |
| 2006 | $5,042,100 | 231,936 | 309,151 |
| 2007 | $5,628,970 | 0 | 0 |
| 2008 | $7,223,278 | 0 | 274,762 |
| 2009 | $4,774,968 | 0 | 351,224 |
| 2010 | $5,695,911 | 139,717 | 405,034 |
| 2011 | $7,151,409 | 0 | 710,202 |
Note: Quantity represents Number of pairs
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