| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.26 | 4 |
| 2015 | 51.3 | 4 |
| 2014 | 51.34 | 4 |
| 2013 | 51.31 | 4 |
| 2012 | 51.62 | 4 |
| 2011 | 51.89 | 4 |
| 2010 | 52.14 | 3 |
| 2009 | 52.4 | 2 |
| 2008 | 52.66 | 2 |
| 2007 | 51.83 | 4 |
| 2006 | 50.56 | 7 |
| 2005 | 49.09 | 19 |
| 2004 | 49.27 | 15 |
| 2003 | 49.46 | 14 |
| 2002 | 49.67 | 12 |
| 2001 | 49.87 | 12 |
| 2000 | 50.06 | 10 |
| 1999 | 50.21 | 8 |
| 1998 | 50.34 | 6 |
| 1997 | 50.26 | 7 |
| 1996 | 50.19 | 7 |
| 1995 | 50.13 | 7 |
| 1994 | 50.22 | 6 |
| 1993 | 50.32 | 6 |
| 1992 | 50.43 | 6 |
| 1991 | 50.53 | 6 |
| 1990 | 50.62 | 6 |