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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $528,077,975 | 962,885,968 | 962,885,968 |
| 2006 | $622,606,854 | 1,004,086,008 | 1,004,086,008 |
| 2007 | $683,614,037 | 923,983,000 | 923,983,000 |
| 2008 | $708,019,416 | 908,962,016 | 908,962,016 |
| 2009 | $489,306,835 | 782,639,992 | 782,639,992 |
| 2010 | $711,929,065 | 859,760,968 | 859,760,968 |
| 2011 | $803,549,212 | 902,610,024 | 902,610,024 |
Note: Quantity represents Weight in kilograms
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