| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 67.37 | 143 |
| 2015 | 68.75 | 146 |
| 2014 | 70.37 | 147 |
| 2013 | 72 | 148 |
| 2012 | 73.65 | 148 |
| 2011 | 75.45 | 149 |
| 2010 | 77.48 | 151 |
| 2009 | 79.35 | 152 |
| 2008 | 81.34 | 157 |
| 2007 | 83.34 | 160 |
| 2006 | 85.15 | 160 |
| 2005 | 86.64 | 164 |
| 2004 | 87.89 | 166 |
| 2003 | 88.83 | 167 |
| 2002 | 89.57 | 166 |
| 2001 | 90.32 | 166 |
| 2000 | 91.26 | 165 |
| 1999 | 91.95 | 165 |
| 1998 | 92.81 | 166 |
| 1997 | 93.71 | 168 |
| 1996 | 94.43 | 169 |
| 1995 | 94.81 | 169 |
| 1994 | 95.48 | 168 |
| 1993 | 95.91 | 169 |
| 1992 | 96.17 | 167 |
| 1991 | 96.44 | 165 |
| 1990 | 96.89 | 167 |
| 1989 | 97.37 | 165 |
| 1988 | 97.86 | 166 |
| 1987 | 98.26 | 164 |
| 1986 | 98.45 | 169 |