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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,756,662,172 | 3,817,418,901 | 3,817,418,901 |
| 2006 | $2,296,378,347 | 4,092,856,978 | 4,092,856,978 |
| 2007 | $2,496,637,391 | 3,992,810,724 | 3,992,810,724 |
| 2008 | $3,556,842,198 | 4,068,214,905 | 4,068,214,905 |
| 2009 | $1,805,008,417 | 3,348,212,947 | 3,348,212,947 |
| 2010 | $2,240,763,737 | 3,039,183,343 | 3,039,183,343 |
| 2011 | $3,026,956,409 | 3,227,111,087 | 3,227,111,087 |
Note: Quantity represents Weight in kilograms
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