| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6 | 50 |
| 2015 | 6.02 | 50 |
| 2014 | 6.03 | 50 |
| 2013 | 6.02 | 50 |
| 2012 | 6 | 47 |
| 2011 | 5.98 | 47 |
| 2010 | 5.96 | 49 |
| 2009 | 5.91 | 49 |
| 2008 | 5.87 | 46 |
| 2007 | 5.82 | 44 |
| 2006 | 5.76 | 41 |
| 2005 | 5.69 | 40 |
| 2004 | 5.65 | 34 |
| 2003 | 5.6 | 30 |
| 2002 | 5.54 | 28 |
| 2001 | 5.48 | 27 |
| 2000 | 5.41 | 25 |
| 1999 | 5.42 | 25 |
| 1998 | 5.41 | 26 |
| 1997 | 5.4 | 24 |
| 1996 | 5.37 | 23 |
| 1995 | 5.33 | 23 |
| 1994 | 5.33 | 21 |
| 1993 | 5.33 | 19 |
| 1992 | 5.33 | 19 |
| 1991 | 5.31 | 21 |
| 1990 | 5.29 | 22 |
| 1989 | 5.29 | 22 |
| 1988 | 5.29 | 23 |
| 1987 | 5.28 | 22 |
| 1986 | 5.27 | 23 |