| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.32 | 12 |
| 2015 | 21.6 | 17 |
| 2014 | 21.79 | 22 |
| 2013 | 21.98 | 23 |
| 2012 | 22.17 | 27 |
| 2011 | 22.36 | 27 |
| 2010 | 22.54 | 29 |
| 2009 | 22.79 | 26 |
| 2008 | 22.98 | 26 |
| 2007 | 23.09 | 24 |
| 2006 | 23.06 | 22 |
| 2005 | 22.92 | 18 |
| 2004 | 23.05 | 15 |
| 2003 | 23.12 | 12 |
| 2002 | 23.21 | 11 |
| 2001 | 23.4 | 10 |
| 2000 | 23.69 | 10 |
| 1999 | 24.12 | 9 |
| 1998 | 24.65 | 9 |
| 1997 | 25.25 | 10 |
| 1996 | 25.86 | 9 |
| 1995 | 26.43 | 12 |
| 1994 | 27.25 | 15 |
| 1993 | 28.12 | 16 |
| 1992 | 29.06 | 18 |
| 1991 | 30.08 | 22 |
| 1990 | 31.18 | 25 |
| 1989 | 32.39 | 27 |
| 1988 | 33.62 | 28 |
| 1987 | 34.81 | 33 |
| 1986 | 35.89 | 35 |