2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $500,000,000 $1,000,000,000 $1,500,000,000 $2,000,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $984,869,063 | 955,470,714 | 955,470,714 |
| 2006 | $1,279,563,122 | 1,137,008,991 | 1,137,008,991 |
| 2007 | $1,561,729,944 | 1,210,684,940 | 1,210,684,940 |
| 2008 | $1,607,615,535 | 1,251,332,672 | 1,251,332,672 |
| 2009 | $1,186,359,199 | 1,305,121,816 | 1,305,121,816 |
| 2010 | $1,593,455,978 | 1,361,243,364 | 1,361,243,364 |
| 2011 | $1,699,714,307 | 1,230,524,372 | 1,230,524,372 |
Note: Quantity represents Weight in kilograms
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