| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.8 | 170 |
| 2015 | -.76 | 167 |
| 2014 | -.76 | 162 |
| 2013 | -.71 | 159 |
| 2012 | -.73 | 162 |
| 2011 | -.74 | 160 |
| 2010 | -.78 | 165 |
| 2009 | -.78 | 165 |
| 2008 | -.83 | 168 |
| 2007 | -.87 | 170 |
| 2006 | -.94 | 173 |
| 2005 | -1.03 | 176 |
| 2004 | -1.08 | 177 |
| 2003 | -1.08 | 177 |
| 2002 | -1.05 | 180 |
| 2001 | -.96 | 181 |
| 2000 | -.86 | 177 |
| 1999 | -.72 | 175 |
| 1998 | -.55 | 168 |
| 1997 | -.44 | 158 |
| 1996 | -.24 | 150 |
| 1995 | -.12 | 144 |
| 1994 | 0.06 | 136 |
| 1993 | 0.37 | 120 |
| 1992 | 0.87 | 99 |
| 1991 | 1.48 | 71 |
| 1990 | 2.22 | 42 |
| 1989 | 2.52 | 34 |
| 1988 | 2.35 | 41 |
| 1987 | 2.67 | 31 |
| 1986 | 2.73 | 29 |