| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.12 | 23 |
| 2015 | 5.08 | 22 |
| 2014 | 5.09 | 21 |
| 2013 | 5.13 | 24 |
| 2012 | 5.18 | 25 |
| 2011 | 5.23 | 24 |
| 2010 | 5.27 | 25 |
| 2009 | 5.34 | 25 |
| 2008 | 5.39 | 26 |
| 2007 | 5.43 | 27 |
| 2006 | 5.46 | 27 |
| 2005 | 5.48 | 28 |
| 2004 | 5.55 | 28 |
| 2003 | 5.61 | 31 |
| 2002 | 5.66 | 34 |
| 2001 | 5.7 | 36 |
| 2000 | 5.73 | 37 |
| 1999 | 5.8 | 42 |
| 1998 | 5.87 | 43 |
| 1997 | 5.92 | 43 |
| 1996 | 5.97 | 44 |
| 1995 | 6 | 46 |
| 1994 | 6.06 | 50 |
| 1993 | 6.12 | 52 |
| 1992 | 6.15 | 52 |
| 1991 | 6.18 | 53 |
| 1990 | 6.18 | 53 |
| 1989 | 6.23 | 55 |
| 1988 | 6.27 | 58 |
| 1987 | 6.29 | 58 |
| 1986 | 6.29 | 63 |