| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.58 | 94 |
| 2015 | 6.47 | 94 |
| 2014 | 6.34 | 93 |
| 2013 | 6.23 | 93 |
| 2012 | 6.14 | 94 |
| 2011 | 6.05 | 94 |
| 2010 | 5.95 | 93 |
| 2009 | 5.84 | 95 |
| 2008 | 5.72 | 95 |
| 2007 | 5.6 | 95 |
| 2006 | 5.49 | 95 |
| 2005 | 5.39 | 97 |
| 2004 | 5.31 | 97 |
| 2003 | 5.23 | 97 |
| 2002 | 5.18 | 97 |
| 2001 | 5.12 | 95 |
| 2000 | 5.06 | 95 |
| 1999 | 5.02 | 92 |
| 1998 | 4.97 | 92 |
| 1997 | 4.91 | 91 |
| 1996 | 4.85 | 89 |
| 1995 | 4.79 | 89 |
| 1994 | 4.72 | 88 |
| 1993 | 4.64 | 90 |
| 1992 | 4.56 | 90 |
| 1991 | 4.48 | 90 |
| 1990 | 4.41 | 89 |
| 1989 | 4.31 | 90 |
| 1988 | 4.23 | 90 |
| 1987 | 4.16 | 93 |
| 1986 | 4.09 | 95 |