| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 29.09 | 63 |
| 2015 | 29.09 | 61 |
| 2014 | 28.99 | 60 |
| 2013 | 28.86 | 58 |
| 2012 | 28.71 | 53 |
| 2011 | 28.56 | 53 |
| 2010 | 28.42 | 53 |
| 2009 | 28.35 | 50 |
| 2008 | 28.29 | 48 |
| 2007 | 28.26 | 47 |
| 2006 | 28.26 | 45 |
| 2005 | 28.28 | 43 |
| 2004 | 28.34 | 40 |
| 2003 | 28.44 | 39 |
| 2002 | 28.57 | 36 |
| 2001 | 28.7 | 32 |
| 2000 | 28.8 | 32 |
| 1999 | 28.99 | 29 |
| 1998 | 29.19 | 27 |
| 1997 | 29.38 | 24 |
| 1996 | 29.55 | 22 |
| 1995 | 29.72 | 22 |
| 1994 | 29.8 | 22 |
| 1993 | 29.82 | 24 |
| 1992 | 29.82 | 24 |
| 1991 | 29.89 | 21 |
| 1990 | 30.08 | 20 |
| 1989 | 30.3 | 18 |
| 1988 | 30.64 | 17 |
| 1987 | 31.06 | 17 |
| 1986 | 31.43 | 17 |