| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.005 | 45 |
| 2015 | 51.045 | 44 |
| 2014 | 51.088 | 42 |
| 2013 | 51.134 | 38 |
| 2012 | 51.18 | 38 |
| 2011 | 51.225 | 37 |
| 2010 | 51.264 | 36 |
| 2009 | 51.299 | 34 |
| 2008 | 51.328 | 33 |
| 2007 | 51.353 | 32 |
| 2006 | 51.374 | 31 |
| 2005 | 51.391 | 31 |
| 2004 | 51.403 | 30 |
| 2003 | 51.413 | 30 |
| 2002 | 51.424 | 31 |
| 2001 | 51.44 | 30 |
| 2000 | 51.465 | 28 |
| 1999 | 51.501 | 27 |
| 1998 | 51.546 | 26 |
| 1997 | 51.6 | 23 |
| 1996 | 51.663 | 20 |
| 1995 | 51.734 | 18 |
| 1994 | 51.814 | 16 |
| 1993 | 51.902 | 15 |
| 1992 | 51.994 | 14 |
| 1991 | 52.084 | 13 |
| 1990 | 52.166 | 12 |
| 1989 | 52.239 | 11 |
| 1988 | 52.302 | 11 |
| 1987 | 52.358 | 12 |
| 1986 | 52.41 | 12 |