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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,324,285,644 | 25,657,940,640 | 25,657,940,640 |
| 2006 | $6,922,788,659 | 28,120,107,879 | 28,120,107,879 |
| 2007 | $10,016,223,999 | 29,840,179,852 | 29,840,179,852 |
| 2008 | $15,537,190,523 | 51,277,718,445 | 51,277,718,445 |
| 2009 | $16,475,854,470 | 40,505,679,020 | 40,505,679,020 |
| 2010 | $18,586,267,607 | 42,350,554,530 | 42,350,554,530 |
| 2011 | $17,563,867,300 | 34,310,514,465 | 34,310,514,465 |
Note: Quantity represents Weight in kilograms
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