| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 24.39 | 23 |
| 2015 | 25.56 | 21 |
| 2014 | 26.45 | 22 |
| 2013 | 26.42 | 24 |
| 2012 | 28.2 | 20 |
| 2011 | 28.37 | 20 |
| 2010 | 28.06 | 23 |
| 2009 | 29.14 | 23 |
| 2008 | 24.84 | 32 |
| 2007 | 25.69 | 28 |
| 2006 | 27.48 | 27 |
| 2005 | 28.29 | 27 |
| 2004 | 28.8 | 28 |
| 2003 | 29.2 | 27 |
| 2002 | 31.68 | 25 |
| 2001 | 27.89 | 29 |
| 2000 | 29.21 | 29 |
| 1999 | 30.03 | 29 |
| 1998 | 30.58 | 33 |
| 1997 | 31.55 | 33 |
| 1996 | 27.2 | 40 |
| 1995 | 26.69 | 41 |
| 1994 | 23.81 | 49 |
| 1993 | 28.71 | 39 |
| 1992 | 29.1 | 36 |
| 1991 | 29.68 | 36 |
| 1990 | 28.58 | 40 |
| 1989 | 32.94 | 21 |
| 1988 | 33.49 | 23 |
| 1987 | 36.17 | 17 |
| 1986 | 36.79 | 17 |