| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.08 | 9 |
| 2015 | 21.06 | 8 |
| 2014 | 21.13 | 9 |
| 2013 | 21.21 | 12 |
| 2012 | 21.34 | 15 |
| 2011 | 21.54 | 19 |
| 2010 | 21.81 | 20 |
| 2009 | 22.1 | 19 |
| 2008 | 22.48 | 21 |
| 2007 | 22.89 | 22 |
| 2006 | 23.26 | 24 |
| 2005 | 23.55 | 22 |
| 2004 | 23.85 | 19 |
| 2003 | 24.06 | 16 |
| 2002 | 24.23 | 13 |
| 2001 | 24.46 | 13 |
| 2000 | 24.83 | 13 |
| 1999 | 25.17 | 13 |
| 1998 | 25.63 | 13 |
| 1997 | 26.1 | 13 |
| 1996 | 26.39 | 14 |
| 1995 | 26.41 | 11 |
| 1994 | 26.21 | 9 |
| 1993 | 25.79 | 7 |
| 1992 | 25.29 | 7 |
| 1991 | 24.94 | 4 |
| 1990 | 24.84 | 4 |
| 1989 | 24.95 | 5 |
| 1988 | 25.26 | 5 |
| 1987 | 25.72 | 5 |
| 1986 | 26.24 | 5 |