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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,599,776,131 | 35,121,215 | 35,121,215 |
| 2006 | $1,804,091,573 | 35,992,515 | 35,992,515 |
| 2007 | $1,140,321,332 | 29,382,170 | 29,382,170 |
| 2008 | $903,328,022 | 23,046,024 | 23,046,024 |
| 2009 | $501,014,287 | 13,684,082 | 13,684,082 |
| 2010 | $473,937,938 | 13,808,487 | 13,808,487 |
| 2011 | $427,318,066 | 10,573,018 | 10,573,018 |
Note: Quantity represents Weight in kilograms
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