| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 80.52 | 163 |
| 2015 | 82.12 | 165 |
| 2014 | 84.02 | 166 |
| 2013 | 85.9 | 172 |
| 2012 | 87.75 | 173 |
| 2011 | 89.58 | 178 |
| 2010 | 91.39 | 178 |
| 2009 | 92.97 | 179 |
| 2008 | 94.36 | 180 |
| 2007 | 95.5 | 180 |
| 2006 | 96.41 | 184 |
| 2005 | 97.1 | 184 |
| 2004 | 97.68 | 184 |
| 2003 | 98.14 | 183 |
| 2002 | 98.47 | 183 |
| 2001 | 98.57 | 182 |
| 2000 | 98.32 | 181 |
| 1999 | 98.78 | 181 |
| 1998 | 99.05 | 183 |
| 1997 | 99.13 | 183 |
| 1996 | 99.03 | 182 |
| 1995 | 98.74 | 180 |
| 1994 | 98.94 | 176 |
| 1993 | 98.97 | 177 |
| 1992 | 98.81 | 175 |
| 1991 | 98.42 | 174 |
| 1990 | 97.77 | 171 |
| 1989 | 97.8 | 168 |
| 1988 | 97.72 | 164 |
| 1987 | 97.52 | 163 |
| 1986 | 97.16 | 161 |