| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.76 | 90 |
| 2015 | 52.66 | 93 |
| 2014 | 52.08 | 88 |
| 2013 | 51.52 | 89 |
| 2012 | 50.98 | 84 |
| 2011 | 50.44 | 81 |
| 2010 | 49.85 | 78 |
| 2009 | 49.67 | 73 |
| 2008 | 49.53 | 71 |
| 2007 | 49.41 | 65 |
| 2006 | 49.25 | 60 |
| 2005 | 49.02 | 55 |
| 2004 | 48.67 | 47 |
| 2003 | 48.2 | 43 |
| 2002 | 47.66 | 38 |
| 2001 | 47.14 | 31 |
| 2000 | 46.7 | 24 |
| 1999 | 46.63 | 20 |
| 1998 | 46.66 | 17 |
| 1997 | 46.78 | 18 |
| 1996 | 46.87 | 18 |
| 1995 | 46.88 | 17 |
| 1994 | 47.4 | 19 |
| 1993 | 47.93 | 21 |
| 1992 | 48.5 | 23 |
| 1991 | 49.15 | 24 |
| 1990 | 49.94 | 28 |
| 1989 | 50.53 | 33 |
| 1988 | 51.22 | 36 |
| 1987 | 51.97 | 41 |
| 1986 | 52.76 | 42 |