| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.9 | 43 |
| 2015 | 5.85 | 44 |
| 2014 | 5.84 | 44 |
| 2013 | 5.84 | 42 |
| 2012 | 5.84 | 42 |
| 2011 | 5.84 | 41 |
| 2010 | 5.84 | 41 |
| 2009 | 5.85 | 44 |
| 2008 | 5.86 | 44 |
| 2007 | 5.85 | 46 |
| 2006 | 5.84 | 46 |
| 2005 | 5.81 | 46 |
| 2004 | 5.85 | 47 |
| 2003 | 5.88 | 47 |
| 2002 | 5.89 | 47 |
| 2001 | 5.89 | 46 |
| 2000 | 5.87 | 46 |
| 1999 | 5.95 | 46 |
| 1998 | 6.02 | 47 |
| 1997 | 6.09 | 48 |
| 1996 | 6.14 | 53 |
| 1995 | 6.17 | 54 |
| 1994 | 6.23 | 54 |
| 1993 | 6.28 | 56 |
| 1992 | 6.32 | 56 |
| 1991 | 6.35 | 61 |
| 1990 | 6.37 | 65 |
| 1989 | 6.48 | 66 |
| 1988 | 6.61 | 75 |
| 1987 | 6.76 | 80 |
| 1986 | 6.91 | 83 |