| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 30.41 | 133 |
| 2015 | 30.53 | 133 |
| 2014 | 30.64 | 133 |
| 2013 | 30.74 | 134 |
| 2012 | 30.83 | 136 |
| 2011 | 30.9 | 138 |
| 2010 | 30.97 | 139 |
| 2009 | 31.02 | 139 |
| 2008 | 31.07 | 139 |
| 2007 | 31.13 | 142 |
| 2006 | 31.18 | 144 |
| 2005 | 31.23 | 144 |
| 2004 | 31.29 | 143 |
| 2003 | 31.34 | 143 |
| 2002 | 31.4 | 142 |
| 2001 | 31.45 | 142 |
| 2000 | 31.5 | 143 |
| 1999 | 31.56 | 143 |
| 1998 | 31.61 | 142 |
| 1997 | 31.6 | 144 |
| 1996 | 31.41 | 145 |
| 1995 | 31.22 | 147 |
| 1994 | 31.03 | 147 |
| 1993 | 30.85 | 147 |
| 1992 | 30.66 | 149 |
| 1991 | 30.48 | 152 |
| 1990 | 30.29 | 154 |
| 1989 | 30.11 | 152 |
| 1988 | 29.93 | 152 |
| 1987 | 29.98 | 157 |
| 1986 | 30.6 | 156 |