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| Year | Trade Value | Weight (kg) | Quantity |
| 2008 | $3,891,503,034 | 8,830,404,078 | 8,830,404,078 |
| 2009 | $1,823,891,520 | 5,535,434,920 | 5,535,434,920 |
| 2010 | $1,712,011,540 | 4,088,805,088 | 4,088,805,088 |
| 2011 | $2,186,113,380 | 3,936,824,936 | 3,936,824,936 |
Note: Quantity represents Weight in kilograms
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