| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.38 | 14 |
| 2015 | 21.3 | 13 |
| 2014 | 21.22 | 11 |
| 2013 | 21.13 | 9 |
| 2012 | 21.04 | 10 |
| 2011 | 20.94 | 10 |
| 2010 | 20.82 | 12 |
| 2009 | 20.77 | 12 |
| 2008 | 20.71 | 11 |
| 2007 | 20.68 | 10 |
| 2006 | 20.7 | 8 |
| 2005 | 20.79 | 6 |
| 2004 | 20.89 | 5 |
| 2003 | 21.04 | 5 |
| 2002 | 21.25 | 3 |
| 2001 | 21.47 | 3 |
| 2000 | 21.67 | 3 |
| 1999 | 21.95 | 3 |
| 1998 | 22.25 | 2 |
| 1997 | 22.58 | 2 |
| 1996 | 22.95 | 2 |
| 1995 | 23.39 | 2 |
| 1994 | 23.89 | 3 |
| 1993 | 24.41 | 4 |
| 1992 | 24.99 | 4 |
| 1991 | 25.68 | 8 |
| 1990 | 26.52 | 9 |
| 1989 | 27.47 | 10 |
| 1988 | 28.62 | 12 |
| 1987 | 29.84 | 13 |
| 1986 | 30.92 | 16 |