| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.92 | 178 |
| 2015 | 83 | 176 |
| 2014 | 83.27 | 177 |
| 2013 | 83.35 | 177 |
| 2012 | 83.26 | 176 |
| 2011 | 83.04 | 176 |
| 2010 | 82.71 | 175 |
| 2009 | 82.62 | 174 |
| 2008 | 82.47 | 170 |
| 2007 | 82.25 | 167 |
| 2006 | 81.94 | 167 |
| 2005 | 81.48 | 165 |
| 2004 | 81.52 | 163 |
| 2003 | 81.55 | 163 |
| 2002 | 81.55 | 162 |
| 2001 | 81.5 | 158 |
| 2000 | 81.37 | 157 |
| 1999 | 81.9 | 156 |
| 1998 | 82.45 | 156 |
| 1997 | 82.97 | 153 |
| 1996 | 83.39 | 151 |
| 1995 | 83.65 | 150 |
| 1994 | 84.47 | 150 |
| 1993 | 85.18 | 150 |
| 1992 | 85.75 | 153 |
| 1991 | 86.12 | 151 |
| 1990 | 86.24 | 151 |
| 1989 | 86.77 | 149 |
| 1988 | 87.1 | 149 |
| 1987 | 87.19 | 148 |
| 1986 | 86.99 | 146 |