| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.96 | 160 |
| 2015 | 75 | 161 |
| 2014 | 76.19 | 162 |
| 2013 | 77.48 | 164 |
| 2012 | 78.81 | 165 |
| 2011 | 80.06 | 167 |
| 2010 | 81.13 | 169 |
| 2009 | 82.27 | 171 |
| 2008 | 83.23 | 174 |
| 2007 | 84.02 | 175 |
| 2006 | 84.72 | 174 |
| 2005 | 85.37 | 174 |
| 2004 | 85.99 | 174 |
| 2003 | 86.52 | 174 |
| 2002 | 86.91 | 175 |
| 2001 | 87.1 | 174 |
| 2000 | 87.03 | 175 |
| 1999 | 87.27 | 171 |
| 1998 | 87.38 | 168 |
| 1997 | 87.38 | 166 |
| 1996 | 87.29 | 165 |
| 1995 | 87.13 | 163 |
| 1994 | 87.48 | 163 |
| 1993 | 87.87 | 160 |
| 1992 | 88.25 | 159 |
| 1991 | 88.52 | 161 |
| 1990 | 88.62 | 160 |
| 1989 | 89.23 | 156 |
| 1988 | 89.75 | 155 |
| 1987 | 90.12 | 156 |
| 1986 | 90.36 | 161 |