| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.81 | 16 |
| 2015 | 4.74 | 14 |
| 2014 | 4.74 | 14 |
| 2013 | 4.78 | 14 |
| 2012 | 4.84 | 15 |
| 2011 | 4.92 | 16 |
| 2010 | 4.99 | 19 |
| 2009 | 5.1 | 20 |
| 2008 | 5.22 | 23 |
| 2007 | 5.34 | 24 |
| 2006 | 5.46 | 28 |
| 2005 | 5.59 | 32 |
| 2004 | 5.75 | 41 |
| 2003 | 5.91 | 49 |
| 2002 | 6.07 | 54 |
| 2001 | 6.23 | 56 |
| 2000 | 6.37 | 58 |
| 1999 | 6.41 | 59 |
| 1998 | 6.41 | 62 |
| 1997 | 6.37 | 61 |
| 1996 | 6.3 | 59 |
| 1995 | 6.21 | 55 |
| 1994 | 6.27 | 55 |
| 1993 | 6.31 | 57 |
| 1992 | 6.32 | 57 |
| 1991 | 6.31 | 59 |
| 1990 | 6.25 | 56 |
| 1989 | 6.28 | 59 |
| 1988 | 6.3 | 60 |
| 1987 | 6.29 | 59 |
| 1986 | 6.28 | 61 |