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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,850,545,842 | 1,762,342,862 | 1,762,342,862 |
| 2006 | $1,894,596,932 | 1,600,908,703 | 1,600,908,703 |
| 2007 | $2,354,499,379 | 1,769,495,468 | 1,769,495,468 |
| 2008 | $2,444,284,457 | 1,575,776,134 | 1,575,776,134 |
| 2009 | $2,737,238,814 | 2,362,921,535 | 2,362,921,535 |
| 2010 | $3,668,994,500 | 2,684,206,302 | 2,684,206,302 |
| 2011 | $4,105,630,133 | 2,705,130,146 | 2,705,130,146 |
Note: Quantity represents Weight in kilograms
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