2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000,000 $200,000,000 $300,000,000 $400,000,000 $500,000,000 $600,000,000 $700,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $378,510,673 | 1,371,597,917 | 1,371,597,917 |
| 2006 | $484,178,253 | 1,398,606,197 | 1,398,606,197 |
| 2007 | $582,705,284 | 1,476,191,690 | 1,476,191,690 |
| 2008 | $633,315,138 | 1,440,297,997 | 1,440,297,997 |
| 2009 | $338,340,585 | 1,501,640,250 | 1,501,640,250 |
| 2010 | $486,563,563 | 1,665,086,618 | 1,665,086,618 |
| 2011 | $586,430,916 | 1,616,733,459 | 1,616,733,459 |
Note: Quantity represents Weight in kilograms
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