| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.24 | 55 |
| 2015 | 6.21 | 55 |
| 2014 | 6.19 | 57 |
| 2013 | 6.17 | 58 |
| 2012 | 6.14 | 57 |
| 2011 | 6.11 | 54 |
| 2010 | 6.06 | 53 |
| 2009 | 6.11 | 55 |
| 2008 | 6.14 | 57 |
| 2007 | 6.18 | 60 |
| 2006 | 6.21 | 62 |
| 2005 | 6.24 | 64 |
| 2004 | 6.3 | 65 |
| 2003 | 6.37 | 65 |
| 2002 | 6.42 | 64 |
| 2001 | 6.47 | 63 |
| 2000 | 6.5 | 64 |
| 1999 | 6.58 | 66 |
| 1998 | 6.66 | 67 |
| 1997 | 6.73 | 70 |
| 1996 | 6.79 | 73 |
| 1995 | 6.84 | 75 |
| 1994 | 6.91 | 74 |
| 1993 | 6.97 | 76 |
| 1992 | 7.03 | 80 |
| 1991 | 7.08 | 86 |
| 1990 | 7.12 | 89 |
| 1989 | 7.17 | 88 |
| 1988 | 7.22 | 88 |
| 1987 | 7.25 | 89 |
| 1986 | 7.28 | 93 |