2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000 $400,000 $600,000 $800,000 $1,000,000 $1,200,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $394,199 | 14,340 | 63,770 |
| 2006 | $519,317 | 3,320 | 6,632 |
| 2007 | $767,120 | 4,269 | 7,900 |
| 2008 | $632,180 | 1,956 | 3,183 |
| 2009 | $831,065 | 3,518 | 5,534 |
| 2010 | $891,518 | 3,144 | 0 |
| 2011 | $1,028,607 | 3,371 | 6,379 |
Note: Quantity represents Number of pairs
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