| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.45 | 15 |
| 2015 | 21.41 | 14 |
| 2014 | 21.27 | 13 |
| 2013 | 21.24 | 13 |
| 2012 | 21.3 | 14 |
| 2011 | 21.36 | 17 |
| 2010 | 21.34 | 15 |
| 2009 | 21.6 | 17 |
| 2008 | 21.93 | 17 |
| 2007 | 22.36 | 19 |
| 2006 | 22.92 | 20 |
| 2005 | 23.62 | 24 |
| 2004 | 24.45 | 25 |
| 2003 | 25.33 | 23 |
| 2002 | 26.28 | 22 |
| 2001 | 27.35 | 25 |
| 2000 | 28.59 | 30 |
| 1999 | 29.83 | 33 |
| 1998 | 31.21 | 37 |
| 1997 | 32.63 | 41 |
| 1996 | 33.91 | 42 |
| 1995 | 34.91 | 44 |
| 1994 | 35.97 | 46 |
| 1993 | 36.8 | 46 |
| 1992 | 37.44 | 45 |
| 1991 | 38.04 | 47 |
| 1990 | 38.69 | 47 |
| 1989 | 39.06 | 46 |
| 1988 | 39.36 | 46 |
| 1987 | 39.53 | 45 |
| 1986 | 39.5 | 45 |