2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000,000 $200,000,000 $300,000,000 $400,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $167,370,890 | 770,243,100 | 770,243,100 |
| 2006 | $202,310,180 | 703,559,100 | 703,559,100 |
| 2007 | $241,335,225 | 713,980,042 | 713,980,042 |
| 2008 | $333,807,394 | 801,734,600 | 801,734,600 |
| 2009 | $138,200,247 | 633,420,100 | 633,420,100 |
| 2010 | $174,651,410 | 618,016,300 | 618,016,300 |
| 2011 | $220,197,274 | 623,076,300 | 623,076,300 |
Note: Quantity represents Weight in kilograms
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