| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 25.94 | 43 |
| 2015 | 26.27 | 45 |
| 2014 | 26.45 | 44 |
| 2013 | 26.72 | 46 |
| 2012 | 27.05 | 48 |
| 2011 | 27.33 | 48 |
| 2010 | 27.45 | 48 |
| 2009 | 27.71 | 48 |
| 2008 | 27.93 | 47 |
| 2007 | 28.11 | 46 |
| 2006 | 28.24 | 44 |
| 2005 | 28.32 | 44 |
| 2004 | 28.32 | 39 |
| 2003 | 28.23 | 38 |
| 2002 | 28.07 | 30 |
| 2001 | 27.88 | 29 |
| 2000 | 27.7 | 25 |
| 1999 | 27.35 | 20 |
| 1998 | 26.96 | 17 |
| 1997 | 26.55 | 16 |
| 1996 | 26.16 | 11 |
| 1995 | 25.77 | 7 |
| 1994 | 25.51 | 6 |
| 1993 | 25.35 | 5 |
| 1992 | 25.29 | 6 |
| 1991 | 25.29 | 6 |
| 1990 | 25.28 | 7 |
| 1989 | 25.57 | 7 |
| 1988 | 25.92 | 7 |
| 1987 | 26.35 | 6 |
| 1986 | 26.93 | 6 |