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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,666,777,912 | 18,819,259,770 | 18,819,259,770 |
| 2006 | $9,062,553,807 | 17,888,386,886 | 17,888,386,886 |
| 2007 | $11,975,786,481 | 21,718,623,670 | 21,718,623,670 |
| 2008 | $16,574,403,158 | 20,301,440,557 | 20,301,440,557 |
| 2009 | $9,206,377,117 | 19,528,830,993 | 19,528,830,993 |
| 2010 | $10,097,446,234 | 16,847,362,458 | 16,847,362,458 |
| 2011 | $14,080,619,429 | 16,420,702,404 | 16,420,702,404 |
Note: Quantity represents Weight in kilograms
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