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 | $273,686,939 | 504,794,982 | 504,794,982 |
| 2006 | $341,628,472 | 625,973,417 | 625,973,417 |
| 2007 | $431,935,133 | 816,012,379 | 816,012,379 |
| 2008 | $515,079,442 | 868,239,830 | 868,239,830 |
| 2009 | $488,946,277 | 1,217,143,249 | 1,217,143,249 |
| 2010 | $587,651,786 | 1,287,917,143 | 1,287,917,143 |
| 2011 | $624,091,077 | 1,269,918,158 | 1,269,918,158 |
Note: Quantity represents Weight in kilograms
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