2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000,000 $400,000,000 $600,000,000 $800,000,000 $1,000,000,000 $1,200,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $580,848,898 | 2,037,646,253 | 2,037,646,253 |
| 2006 | $671,082,646 | 1,938,998,386 | 1,938,998,386 |
| 2007 | $847,218,159 | 2,052,518,247 | 2,052,518,247 |
| 2008 | $917,590,188 | 1,888,846,316 | 1,888,846,316 |
| 2009 | $414,162,314 | 1,821,840,097 | 1,821,840,097 |
| 2010 | $586,091,338 | 1,918,900,748 | 1,918,900,748 |
| 2011 | $664,628,639 | 1,767,967,080 | 1,767,967,080 |
Note: Quantity represents Weight in kilograms
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