| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.55 | 6 |
| 2015 | 83.73 | 6 |
| 2014 | 83.9 | 6 |
| 2013 | 84.06 | 6 |
| 2012 | 84.2 | 6 |
| 2011 | 84.34 | 6 |
| 2010 | 84.46 | 6 |
| 2009 | 84.57 | 6 |
| 2008 | 84.67 | 6 |
| 2007 | 84.77 | 6 |
| 2006 | 84.86 | 6 |
| 2005 | 84.95 | 6 |
| 2004 | 85.04 | 7 |
| 2003 | 85.13 | 7 |
| 2002 | 85.21 | 6 |
| 2001 | 85.3 | 6 |
| 2000 | 85.39 | 6 |
| 1999 | 85.48 | 7 |
| 1998 | 85.62 | 8 |
| 1997 | 86 | 7 |
| 1996 | 86.37 | 6 |
| 1995 | 86.74 | 6 |
| 1994 | 87.09 | 6 |
| 1993 | 87.44 | 6 |
| 1992 | 87.78 | 6 |
| 1991 | 88.12 | 6 |
| 1990 | 88.44 | 6 |
| 1989 | 88.76 | 6 |
| 1988 | 89.07 | 6 |
| 1987 | 89.36 | 6 |
| 1986 | 89.6 | 6 |