| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 87.85 | 32 |
| 2015 | 87.68 | 32 |
| 2014 | 87.5 | 30 |
| 2013 | 87.32 | 31 |
| 2012 | 87.14 | 31 |
| 2011 | 86.96 | 32 |
| 2010 | 86.8 | 32 |
| 2009 | 86.65 | 31 |
| 2008 | 86.49 | 31 |
| 2007 | 86.29 | 31 |
| 2006 | 86.1 | 31 |
| 2005 | 85.86 | 32 |
| 2004 | 85.57 | 31 |
| 2003 | 85.36 | 31 |
| 2002 | 85.25 | 31 |
| 2001 | 85.15 | 30 |
| 2000 | 85.1 | 29 |
| 1999 | 85.09 | 29 |
| 1998 | 85.06 | 29 |
| 1997 | 85.03 | 29 |
| 1996 | 85.01 | 28 |
| 1995 | 84.98 | 27 |
| 1994 | 84.95 | 26 |
| 1993 | 84.93 | 26 |
| 1992 | 84.9 | 26 |
| 1991 | 84.87 | 25 |
| 1990 | 84.84 | 23 |
| 1989 | 84.78 | 23 |
| 1988 | 84.67 | 23 |
| 1987 | 84.57 | 23 |
| 1986 | 84.46 | 23 |