| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.94 | 6 |
| 2015 | 19.95 | 6 |
| 2014 | 20 | 6 |
| 2013 | 20.1 | 6 |
| 2012 | 20.26 | 6 |
| 2011 | 20.43 | 6 |
| 2010 | 20.58 | 9 |
| 2009 | 20.75 | 11 |
| 2008 | 20.91 | 12 |
| 2007 | 21.08 | 13 |
| 2006 | 21.3 | 12 |
| 2005 | 21.61 | 11 |
| 2004 | 21.89 | 9 |
| 2003 | 22.24 | 8 |
| 2002 | 22.61 | 9 |
| 2001 | 22.93 | 9 |
| 2000 | 23.12 | 6 |
| 1999 | 23.35 | 6 |
| 1998 | 23.49 | 4 |
| 1997 | 23.58 | 4 |
| 1996 | 23.69 | 3 |
| 1995 | 23.85 | 3 |
| 1994 | 23.78 | 2 |
| 1993 | 23.68 | 2 |
| 1992 | 23.55 | 2 |
| 1991 | 23.36 | 1 |
| 1990 | 23.1 | 1 |
| 1989 | 22.91 | 1 |
| 1988 | 22.7 | 1 |
| 1987 | 22.56 | 1 |
| 1986 | 22.63 | 1 |