| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 78.15 | 171 |
| 2015 | 78.27 | 169 |
| 2014 | 78.12 | 166 |
| 2013 | 77.82 | 165 |
| 2012 | 77.35 | 161 |
| 2011 | 76.68 | 161 |
| 2010 | 75.77 | 158 |
| 2009 | 75.86 | 158 |
| 2008 | 75.82 | 158 |
| 2007 | 75.71 | 157 |
| 2006 | 75.63 | 155 |
| 2005 | 75.61 | 153 |
| 2004 | 75.54 | 152 |
| 2003 | 75.59 | 150 |
| 2002 | 75.7 | 148 |
| 2001 | 75.77 | 147 |
| 2000 | 75.72 | 144 |
| 1999 | 76.2 | 139 |
| 1998 | 76.68 | 136 |
| 1997 | 77.18 | 133 |
| 1996 | 77.74 | 131 |
| 1995 | 78.35 | 132 |
| 1994 | 79.25 | 130 |
| 1993 | 80.23 | 132 |
| 1992 | 81.23 | 131 |
| 1991 | 82.16 | 135 |
| 1990 | 82.97 | 136 |
| 1989 | 83.92 | 139 |
| 1988 | 84.74 | 138 |
| 1987 | 85.42 | 138 |
| 1986 | 85.95 | 141 |