2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000 $20,000,000 $25,000,000 $30,000,000 $35,000,000 $40,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,936,000 | 1,621,062 | 390 |
| 2006 | $10,133,500 | 2,249,753 | 602 |
| 2007 | $15,842,200 | 3,381,190 | 1,022 |
| 2008 | $32,262,900 | 5,794,371 | 2,066 |
| 2009 | $12,340,700 | 2,065,722 | 960 |
| 2010 | $21,390,100 | 4,190,437 | 966 |
| 2011 | $19,711,500 | 4,199,771 | 921 |
Note: Quantity represents Number of items
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