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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,188,817,786 | 30,219,540,106 | 30,219,540,106 |
| 2006 | $14,377,892,074 | 31,883,501,712 | 31,883,501,712 |
| 2007 | $14,443,431,730 | 30,355,527,930 | 30,355,527,930 |
| 2008 | $21,887,921,065 | 29,634,224,430 | 29,634,224,430 |
| 2009 | $13,938,955,438 | 242,933,437,137 | 242,933,437,137 |
| 2010 | $20,826,317,015 | 48,528,221,228 | 48,528,221,228 |
Note: Quantity represents Weight in kilograms
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