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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,350,488,555 | 7,323,951,331 | 7,323,951,331 |
| 2006 | $4,323,130,506 | 6,703,809,465 | 6,703,809,465 |
| 2007 | $3,731,233,238 | 6,030,298,217 | 6,030,298,217 |
| 2008 | $4,025,467,760 | 6,456,773,522 | 6,456,773,522 |
| 2009 | $2,462,708,053 | 3,943,759,072 | 3,943,759,072 |
| 2010 | $2,576,956,987 | 4,228,570,162 | 4,228,570,162 |
| 2011 | $2,807,015,620 | 4,168,772,944 | 4,168,772,944 |
Note: Quantity represents Weight in kilograms
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