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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $601,205,831 | 19,882,681,120 | 19,882,681,120 |
| 2006 | $806,316,197 | 20,418,960,064 | 20,418,960,064 |
| 2007 | $1,075,827,103 | 20,850,409,056 | 20,850,409,056 |
| 2008 | $1,928,916,582 | 20,597,150,928 | 20,597,150,928 |
| 2009 | $1,093,508,533 | 22,951,113,024 | 22,951,113,024 |
| 2010 | $2,337,267,306 | 26,778,254,184 | 26,778,254,184 |
| 2011 | $3,382,987,089 | 30,062,552,864 | 30,062,552,864 |
Note: Quantity represents Weight in kilograms
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