| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.53 | 79 |
| 2015 | 50.85 | 75 |
| 2014 | 50.34 | 72 |
| 2013 | 50.05 | 72 |
| 2012 | 49.89 | 76 |
| 2011 | 49.66 | 76 |
| 2010 | 49.26 | 72 |
| 2009 | 49.13 | 71 |
| 2008 | 48.99 | 65 |
| 2007 | 48.89 | 60 |
| 2006 | 48.94 | 56 |
| 2005 | 49.21 | 57 |
| 2004 | 49.34 | 52 |
| 2003 | 49.5 | 51 |
| 2002 | 49.6 | 51 |
| 2001 | 49.47 | 50 |
| 2000 | 49 | 45 |
| 1999 | 48.75 | 39 |
| 1998 | 48.37 | 33 |
| 1997 | 47.93 | 25 |
| 1996 | 47.56 | 22 |
| 1995 | 47.34 | 20 |
| 1994 | 46.98 | 16 |
| 1993 | 46.66 | 17 |
| 1992 | 46.35 | 16 |
| 1991 | 46.02 | 16 |
| 1990 | 45.7 | 12 |
| 1989 | 45.75 | 11 |
| 1988 | 45.78 | 10 |
| 1987 | 45.82 | 10 |
| 1986 | 45.87 | 9 |