2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $2,000,000,000 $4,000,000,000 $6,000,000,000 $8,000,000,000 $10,000,000,000 $12,000,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $247,901,636 | 2,696,049 | 2,696,049 |
| 2006 | $204,509,812 | 2,943,222 | 2,943,222 |
| 2007 | $8,466,491,686 | 23,873,335 | 23,873,335 |
| 2008 | $10,507,600,397 | 26,254,756 | 26,254,756 |
| 2009 | $9,815,707,709 | 27,427,720 | 27,427,720 |
| 2010 | $8,666,920,830 | 26,455,129 | 26,455,129 |
| 2011 | $8,959,131,232 | 23,547,400 | 23,547,400 |
Note: Quantity represents Weight in kilograms
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