| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.2 | 161 |
| 2015 | 79.51 | 160 |
| 2014 | 79.72 | 160 |
| 2013 | 79.88 | 159 |
| 2012 | 80.04 | 158 |
| 2011 | 80.22 | 156 |
| 2010 | 80.41 | 156 |
| 2009 | 80.47 | 156 |
| 2008 | 80.59 | 154 |
| 2007 | 80.79 | 154 |
| 2006 | 81.13 | 154 |
| 2005 | 81.63 | 153 |
| 2004 | 82.09 | 154 |
| 2003 | 82.66 | 149 |
| 2002 | 83.31 | 149 |
| 2001 | 84.03 | 148 |
| 2000 | 84.8 | 147 |
| 1999 | 86.3 | 148 |
| 1998 | 87.82 | 149 |
| 1997 | 89.27 | 152 |
| 1996 | 90.54 | 155 |
| 1995 | 91.53 | 157 |
| 1994 | 93.21 | 162 |
| 1993 | 94.6 | 164 |
| 1992 | 95.7 | 163 |
| 1991 | 96.59 | 167 |
| 1990 | 97.33 | 170 |
| 1989 | 99.26 | 172 |
| 1988 | 101.03 | 181 |
| 1987 | 102.61 | 184 |
| 1986 | 103.91 | 186 |