2004 2005 2006 2007 2008 2009 2010 $0 $500,000 $1,000,000 $1,500,000 $2,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $601,935 | 343,619 | 1,068,875 |
| 2006 | $1,470,210 | 750,557 | 2,455,009 |
| 2007 | $256,942 | 14,759 | 38,701 |
| 2008 | $220,787 | 25,333 | 30,512 |
| 2009 | $293,330 | 11,224 | 17,946 |
Note: Quantity represents Number of pairs
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