| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 25.836 | 4 |
| 2014 | 24.531 | 5 |
| 2013 | 24.334 | 5 |
| 2012 | 21.093 | 10 |
| 2011 | 22.462 | 8 |
| 2010 | 23.4 | 8 |
| 2009 | 22.616 | 9 |
| 2008 | 23.594 | 11 |
| 2007 | 22.96 | 13 |
| 2006 | 24.155 | 11 |
| 2005 | 23.285 | 16 |
| 2004 | 20.315 | 26 |
| 2003 | 16.728 | 46 |
| 2002 | 14.211 | 69 |
| 2001 | 21.05 | 35 |
| 2000 | 25.59 | 25 |
| 1999 | 26.235 | 31 |
| 1998 | 50.89 | 9 |
| 1997 | 75.52 | 5 |