| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.15 | 161 |
| 2015 | 74.45 | 160 |
| 2014 | 74.59 | 159 |
| 2013 | 74.66 | 159 |
| 2012 | 74.72 | 158 |
| 2011 | 74.8 | 155 |
| 2010 | 74.91 | 155 |
| 2009 | 74.89 | 155 |
| 2008 | 74.97 | 156 |
| 2007 | 75.15 | 154 |
| 2006 | 75.48 | 154 |
| 2005 | 75.98 | 154 |
| 2004 | 76.4 | 153 |
| 2003 | 76.93 | 152 |
| 2002 | 77.55 | 151 |
| 2001 | 78.25 | 150 |
| 2000 | 79.03 | 151 |
| 1999 | 80.47 | 150 |
| 1998 | 81.94 | 151 |
| 1997 | 83.36 | 154 |
| 1996 | 84.61 | 157 |
| 1995 | 85.61 | 161 |
| 1994 | 87.26 | 162 |
| 1993 | 88.65 | 163 |
| 1992 | 89.76 | 165 |
| 1991 | 90.67 | 169 |
| 1990 | 91.43 | 172 |
| 1989 | 93.3 | 174 |
| 1988 | 95 | 181 |
| 1987 | 96.51 | 183 |
| 1986 | 97.75 | 184 |