| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.01 | 158 |
| 2015 | 22.4 | 157 |
| 2014 | 21.8 | 158 |
| 2013 | 21.19 | 158 |
| 2012 | 20.59 | 157 |
| 2011 | 20.07 | 157 |
| 2010 | 19.64 | 156 |
| 2009 | 19.21 | 155 |
| 2008 | 18.87 | 155 |
| 2007 | 18.61 | 153 |
| 2006 | 18.39 | 153 |
| 2005 | 18.17 | 153 |
| 2004 | 18.1 | 153 |
| 2003 | 18.06 | 153 |
| 2002 | 18.04 | 155 |
| 2001 | 18.04 | 157 |
| 2000 | 18.05 | 159 |
| 1999 | 17.99 | 159 |
| 1998 | 17.93 | 158 |
| 1997 | 17.87 | 158 |
| 1996 | 17.79 | 158 |
| 1995 | 17.66 | 159 |
| 1994 | 17.55 | 161 |
| 1993 | 17.41 | 163 |
| 1992 | 17.25 | 163 |
| 1991 | 17.09 | 166 |
| 1990 | 16.94 | 167 |
| 1989 | 16.73 | 166 |
| 1988 | 16.51 | 166 |
| 1987 | 16.29 | 166 |
| 1986 | 16.09 | 165 |