| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.614 | 83 |
| 2015 | 7.079 | 93 |
| 2014 | 7.457 | 96 |
| 2013 | 8.043 | 96 |
| 2012 | 8.495 | 96 |
| 2011 | 8.868 | 89 |
| 2010 | 9.483 | 86 |
| 2009 | 10.073 | 87 |
| 2008 | 9.683 | 91 |
| 2007 | 10.233 | 88 |
| 2006 | 11.292 | 74 |
| 2005 | 12.133 | 67 |
| 2004 | 12.442 | 68 |
| 2003 | 16.001 | 51 |
| 2002 | 18.363 | 40 |
| 2001 | 19.35 | 49 |
| 2000 | 18.929 | 52 |
| 1999 | 20.448 | 50 |
| 1998 | 21.033 | 52 |
| 1997 | 21.417 | 47 |
| 1996 | 21.583 | 51 |
| 1995 | 45.948 | 15 |
| 1994 | 159.82 | 3 |