| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 85.72 | 4 |
| 2015 | 85.71 | 4 |
| 2014 | 85.7 | 4 |
| 2013 | 85.67 | 4 |
| 2012 | 85.64 | 4 |
| 2011 | 85.59 | 4 |
| 2010 | 85.54 | 4 |
| 2009 | 85.48 | 5 |
| 2008 | 85.43 | 5 |
| 2007 | 85.37 | 5 |
| 2006 | 85.32 | 5 |
| 2005 | 85.26 | 5 |
| 2004 | 85.21 | 5 |
| 2003 | 85.15 | 6 |
| 2002 | 85.09 | 7 |
| 2001 | 85.04 | 8 |
| 2000 | 84.87 | 9 |
| 1999 | 84.59 | 9 |
| 1998 | 84.3 | 10 |
| 1997 | 84.01 | 12 |
| 1996 | 83.71 | 13 |
| 1995 | 83.52 | 13 |
| 1994 | 83.43 | 15 |
| 1993 | 83.35 | 17 |
| 1992 | 83.26 | 17 |
| 1991 | 83.18 | 17 |
| 1990 | 83.07 | 19 |
| 1989 | 82.94 | 19 |
| 1988 | 82.8 | 19 |
| 1987 | 82.66 | 19 |
| 1986 | 82.52 | 22 |