| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 89.7 | 26 |
| 2015 | 89.53 | 26 |
| 2014 | 89.36 | 25 |
| 2013 | 89.18 | 25 |
| 2012 | 88.99 | 25 |
| 2011 | 88.79 | 26 |
| 2010 | 88.59 | 25 |
| 2009 | 88.38 | 26 |
| 2008 | 88.16 | 27 |
| 2007 | 87.93 | 27 |
| 2006 | 87.69 | 27 |
| 2005 | 87.44 | 27 |
| 2004 | 87.19 | 27 |
| 2003 | 86.92 | 26 |
| 2002 | 86.65 | 26 |
| 2001 | 86.36 | 26 |
| 2000 | 86.07 | 26 |
| 1999 | 85.78 | 27 |
| 1998 | 85.48 | 28 |
| 1997 | 85.17 | 28 |
| 1996 | 84.86 | 29 |
| 1995 | 84.55 | 29 |
| 1994 | 84.22 | 29 |
| 1993 | 83.9 | 28 |
| 1992 | 83.56 | 28 |
| 1991 | 83.4 | 28 |
| 1990 | 83.27 | 27 |
| 1989 | 83.14 | 27 |
| 1988 | 83.01 | 28 |
| 1987 | 82.89 | 28 |
| 1986 | 82.76 | 27 |