| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53.8 | 100 |
| 2015 | 53.41 | 100 |
| 2014 | 52.82 | 98 |
| 2013 | 52.24 | 95 |
| 2012 | 51.68 | 88 |
| 2011 | 51.18 | 86 |
| 2010 | 50.71 | 83 |
| 2009 | 50.35 | 79 |
| 2008 | 50.01 | 74 |
| 2007 | 49.64 | 69 |
| 2006 | 49.16 | 58 |
| 2005 | 48.55 | 48 |
| 2004 | 48.41 | 44 |
| 2003 | 48.19 | 42 |
| 2002 | 47.98 | 42 |
| 2001 | 47.84 | 39 |
| 2000 | 47.8 | 36 |
| 1999 | 47.85 | 32 |
| 1998 | 48.01 | 30 |
| 1997 | 48.26 | 28 |
| 1996 | 48.53 | 29 |
| 1995 | 48.79 | 30 |
| 1994 | 49.27 | 29 |
| 1993 | 49.82 | 29 |
| 1992 | 50.45 | 32 |
| 1991 | 51.16 | 38 |
| 1990 | 51.93 | 46 |
| 1989 | 52.75 | 47 |
| 1988 | 53.6 | 50 |
| 1987 | 54.42 | 52 |
| 1986 | 55.15 | 53 |