2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $10,000,000 $20,000,000 $30,000,000 $40,000,000 $50,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $8,302,280 | 2,411,948 | 534,492 |
| 2006 | $11,804,935 | 4,769,902 | 759,989 |
| 2007 | $14,534,656 | 6,020,133 | 0 |
| 2008 | $26,000,556 | 8,916,507 | 0 |
| 2009 | $34,550,386 | 8,967,667 | 0 |
| 2010 | $36,967,839 | 11,414,056 | 0 |
| 2011 | $30,172,530 | 9,332,805 | 0 |
Note: Quantity represents Number of pairs
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