| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.2 | 162 |
| 2015 | 75.78 | 164 |
| 2014 | 77.67 | 165 |
| 2013 | 79.55 | 168 |
| 2012 | 81.4 | 174 |
| 2011 | 83.25 | 178 |
| 2010 | 85.08 | 179 |
| 2009 | 86.69 | 179 |
| 2008 | 88.11 | 180 |
| 2007 | 89.3 | 180 |
| 2006 | 90.25 | 182 |
| 2005 | 90.99 | 183 |
| 2004 | 91.56 | 183 |
| 2003 | 92 | 181 |
| 2002 | 92.32 | 180 |
| 2001 | 92.42 | 181 |
| 2000 | 92.19 | 181 |
| 1999 | 92.61 | 181 |
| 1998 | 92.87 | 183 |
| 1997 | 92.97 | 184 |
| 1996 | 92.89 | 182 |
| 1995 | 92.61 | 182 |
| 1994 | 92.8 | 178 |
| 1993 | 92.79 | 178 |
| 1992 | 92.59 | 174 |
| 1991 | 92.18 | 173 |
| 1990 | 91.55 | 173 |
| 1989 | 91.59 | 169 |
| 1988 | 91.56 | 165 |
| 1987 | 91.44 | 166 |
| 1986 | 91.16 | 163 |