| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 48.7 | 26 |
| 2015 | 48.76 | 25 |
| 2014 | 48.81 | 25 |
| 2013 | 48.82 | 26 |
| 2012 | 49.38 | 17 |
| 2011 | 50.48 | 9 |
| 2010 | 50.37 | 9 |
| 2009 | 49.7 | 15 |
| 2008 | 48.43 | 30 |
| 2007 | 49.22 | 20 |
| 2006 | 49.37 | 17 |
| 2005 | 49.54 | 13 |
| 2004 | 49.65 | 13 |
| 2003 | 50.46 | 7 |
| 2002 | 51.19 | 4 |
| 2001 | 51.86 | 4 |
| 2000 | 51.14 | 4 |
| 1999 | 51.55 | 4 |
| 1998 | 50.57 | 5 |
| 1997 | 50.72 | 5 |
| 1996 | 50.91 | 4 |
| 1995 | 50.81 | 5 |
| 1994 | 50.84 | 5 |
| 1993 | 50.89 | 4 |
| 1992 | 50.98 | 4 |
| 1991 | 51.08 | 4 |
| 1990 | 51.21 | 3 |