| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.47 | 159 |
| 2015 | 77.73 | 158 |
| 2014 | 78.38 | 158 |
| 2013 | 79.19 | 158 |
| 2012 | 80.12 | 159 |
| 2011 | 81.02 | 159 |
| 2010 | 81.75 | 157 |
| 2009 | 82.13 | 159 |
| 2008 | 82.37 | 159 |
| 2007 | 82.52 | 158 |
| 2006 | 82.73 | 158 |
| 2005 | 83.16 | 159 |
| 2004 | 83.76 | 158 |
| 2003 | 84.51 | 157 |
| 2002 | 85.33 | 154 |
| 2001 | 86.07 | 154 |
| 2000 | 86.63 | 156 |
| 1999 | 87.66 | 155 |
| 1998 | 88.6 | 154 |
| 1997 | 89.53 | 153 |
| 1996 | 90.58 | 156 |
| 1995 | 91.81 | 159 |
| 1994 | 93.02 | 159 |
| 1993 | 94.4 | 162 |
| 1992 | 95.89 | 164 |
| 1991 | 97.36 | 171 |
| 1990 | 98.71 | 174 |
| 1989 | 99.34 | 173 |
| 1988 | 99.81 | 174 |
| 1987 | 100.14 | 178 |
| 1986 | 100.44 | 177 |