| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.32 | 167 |
| 2015 | 83.18 | 167 |
| 2014 | 84.16 | 167 |
| 2013 | 85.05 | 167 |
| 2012 | 85.78 | 167 |
| 2011 | 86.31 | 169 |
| 2010 | 86.63 | 170 |
| 2009 | 87.01 | 168 |
| 2008 | 87.03 | 168 |
| 2007 | 86.86 | 164 |
| 2006 | 86.63 | 164 |
| 2005 | 86.36 | 161 |
| 2004 | 86.35 | 161 |
| 2003 | 86.55 | 161 |
| 2002 | 86.73 | 158 |
| 2001 | 86.65 | 155 |
| 2000 | 86.32 | 153 |
| 1999 | 87.09 | 151 |
| 1998 | 87.45 | 148 |
| 1997 | 87.75 | 148 |
| 1996 | 88.26 | 148 |
| 1995 | 88.87 | 145 |
| 1994 | 89.03 | 143 |
| 1993 | 89.97 | 143 |
| 1992 | 91.11 | 147 |
| 1991 | 91.98 | 151 |
| 1990 | 92.33 | 153 |
| 1989 | 93.12 | 153 |
| 1988 | 93.67 | 152 |
| 1987 | 93.84 | 150 |
| 1986 | 93.58 | 148 |