| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.33 | 177 |
| 2015 | 83.08 | 177 |
| 2014 | 82.63 | 176 |
| 2013 | 81.97 | 175 |
| 2012 | 81.1 | 172 |
| 2011 | 80.03 | 166 |
| 2010 | 78.84 | 164 |
| 2009 | 79.05 | 162 |
| 2008 | 79.03 | 162 |
| 2007 | 78.83 | 161 |
| 2006 | 78.47 | 161 |
| 2005 | 77.96 | 159 |
| 2004 | 78.27 | 158 |
| 2003 | 78.49 | 156 |
| 2002 | 78.59 | 153 |
| 2001 | 78.5 | 151 |
| 2000 | 78.17 | 148 |
| 1999 | 78.77 | 147 |
| 1998 | 79.23 | 145 |
| 1997 | 79.53 | 146 |
| 1996 | 79.69 | 144 |
| 1995 | 79.69 | 138 |
| 1994 | 80.45 | 135 |
| 1993 | 81.09 | 134 |
| 1992 | 81.58 | 135 |
| 1991 | 81.87 | 134 |
| 1990 | 81.88 | 131 |
| 1989 | 81.66 | 129 |
| 1988 | 81.28 | 130 |
| 1987 | 80.72 | 127 |
| 1986 | 79.94 | 126 |