2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $500,000,000 $1,000,000,000 $1,500,000,000 $2,000,000,000 $2,500,000,000 $3,000,000,000 $3,500,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,116,472,594 | 4,623,772,892 | 4,623,772,892 |
| 2006 | $1,119,859,495 | 6,310,248,445 | 6,310,248,445 |
| 2007 | $1,381,065,401 | 6,337,233,610 | 6,337,233,610 |
| 2008 | $2,560,008,292 | 6,117,613,964 | 6,117,613,964 |
| 2009 | $1,080,362,602 | 4,813,103,664 | 4,813,103,664 |
| 2010 | $2,288,587,792 | 6,683,072,899 | 6,683,072,899 |
| 2011 | $2,824,722,988 | 6,538,411,807 | 6,538,411,807 |
Note: Quantity represents Weight in kilograms
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