| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.78 | 167 |
| 2015 | 77.64 | 167 |
| 2014 | 78.58 | 168 |
| 2013 | 79.41 | 167 |
| 2012 | 80.09 | 166 |
| 2011 | 80.58 | 169 |
| 2010 | 80.9 | 168 |
| 2009 | 81.26 | 168 |
| 2008 | 81.3 | 167 |
| 2007 | 81.16 | 164 |
| 2006 | 80.98 | 163 |
| 2005 | 80.74 | 162 |
| 2004 | 80.68 | 162 |
| 2003 | 80.85 | 161 |
| 2002 | 80.99 | 159 |
| 2001 | 80.88 | 157 |
| 2000 | 80.55 | 154 |
| 1999 | 81.38 | 154 |
| 1998 | 81.77 | 150 |
| 1997 | 82.08 | 148 |
| 1996 | 82.57 | 148 |
| 1995 | 83.16 | 149 |
| 1994 | 83.25 | 144 |
| 1993 | 84.16 | 146 |
| 1992 | 85.31 | 148 |
| 1991 | 86.23 | 153 |
| 1990 | 86.67 | 154 |
| 1989 | 87.42 | 154 |
| 1988 | 87.98 | 154 |
| 1987 | 88.22 | 152 |
| 1986 | 88.06 | 151 |