| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.62 | 10 |
| 2015 | 4.63 | 12 |
| 2014 | 4.68 | 12 |
| 2013 | 4.72 | 13 |
| 2012 | 4.76 | 13 |
| 2011 | 4.79 | 12 |
| 2010 | 4.81 | 13 |
| 2009 | 4.88 | 14 |
| 2008 | 4.93 | 15 |
| 2007 | 4.98 | 16 |
| 2006 | 5.01 | 16 |
| 2005 | 5.04 | 18 |
| 2004 | 5.14 | 18 |
| 2003 | 5.23 | 22 |
| 2002 | 5.33 | 23 |
| 2001 | 5.41 | 25 |
| 2000 | 5.48 | 28 |
| 1999 | 5.63 | 32 |
| 1998 | 5.77 | 37 |
| 1997 | 5.91 | 41 |
| 1996 | 6.03 | 47 |
| 1995 | 6.12 | 52 |
| 1994 | 6.27 | 56 |
| 1993 | 6.4 | 60 |
| 1992 | 6.51 | 65 |
| 1991 | 6.59 | 68 |
| 1990 | 6.64 | 73 |
| 1989 | 6.7 | 76 |
| 1988 | 6.73 | 79 |
| 1987 | 6.74 | 78 |
| 1986 | 6.71 | 76 |