| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.09 | 9 |
| 2015 | 4.25 | 14 |
| 2014 | 3.94 | 16 |
| 2013 | 4 | 14 |
| 2012 | 3.58 | 17 |
| 2011 | 3.85 | 13 |
| 2010 | 4.27 | 9 |
| 2009 | 4.16 | 15 |
| 2008 | 3.4 | 20 |
| 2007 | 3.04 | 26 |
| 2006 | 2.95 | 29 |
| 2005 | 2.87 | 26 |
| 2004 | 2.74 | 34 |
| 2003 | 2.73 | 37 |
| 2002 | 2.7 | 42 |
| 2001 | 3.13 | 33 |
| 2000 | 3.56 | 26 |
| 1999 | 3.7 | 29 |
| 1998 | 3.53 | 26 |
| 1997 | 3.91 | 27 |
| 1996 | 3.28 | 30 |
| 1995 | 4.06 | 22 |
| 1993 | 2.12 | 70 |
| 1992 | 2.1 | 73 |