| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.46 | 31 |
| 2015 | 3.49 | 31 |
| 2014 | 3.53 | 34 |
| 2013 | 3.57 | 34 |
| 2012 | 3.62 | 35 |
| 2011 | 3.54 | 32 |
| 2010 | 3.55 | 28 |
| 2009 | 3.91 | 32 |
| 2008 | 4.15 | 48 |
| 2007 | 3.72 | 38 |
| 2006 | 4.33 | 45 |
| 2005 | 4.4 | 40 |
| 2004 | 3.89 | 33 |
| 2003 | 3.93 | 33 |
| 2002 | 4.32 | 41 |
| 2001 | 3.78 | 34 |
| 2000 | 4.31 | 39 |
| 1999 | 4.22 | 36 |
| 1998 | 4.12 | 40 |
| 1997 | 4.39 | 42 |
| 1996 | 3.95 | 36 |
| 1995 | 3.97 | 39 |
| 1994 | 3.7 | 36 |
| 1993 | 4.06 | 43 |
| 1992 | 3.9 | 43 |
| 1991 | 4 | 48 |