| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.496 | 66 |
| 2015 | 2.886 | 69 |
| 2014 | 3.699 | 67 |
| 2013 | 4.418 | 59 |
| 2012 | 5.089 | 61 |
| 2011 | 5.911 | 52 |
| 2010 | 7.067 | 44 |
| 2009 | 7.046 | 55 |
| 2008 | 5.892 | 72 |
| 2007 | 4.875 | 86 |
| 2006 | 4.658 | 77 |
| 2005 | 5.225 | 61 |
| 2004 | 6.542 | 47 |
| 2003 | 7.972 | 46 |
| 2002 | 9.56 | 32 |
| 2001 | 9.973 | 37 |
| 2000 | 11.18 | 35 |
| 1999 | 11.396 | 44 |
| 1998 | 11.683 | 49 |
| 1997 | 11.642 | 54 |
| 1996 | 12.75 | 51 |
| 1995 | 24.071 | 25 |
| 1994 | 117.558 | 3 |