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
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,022,000 | 407,015 | 1,003,392 |
| 2006 | $15,028,000 | 508,786 | 1,254,282 |
| 2007 | $19,445,000 | 799,636 | 1,591,994 |
| 2008 | $23,002,000 | 836,837 | 1,600,495 |
| 2009 | $19,835,000 | 596,392 | 1,233,571 |
| 2010 | $23,374,000 | 778,652 | 1,578,929 |
| 2011 | $28,357,000 | 961,477 | 2,090,224 |
Note: Quantity represents Number of items
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