| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.31 | 118 |
| 2015 | 55.98 | 114 |
| 2014 | 55.29 | 109 |
| 2013 | 54.59 | 105 |
| 2012 | 53.98 | 104 |
| 2011 | 53.48 | 101 |
| 2010 | 52.95 | 96 |
| 2009 | 52.58 | 95 |
| 2008 | 52.23 | 92 |
| 2007 | 51.89 | 84 |
| 2006 | 51.57 | 79 |
| 2005 | 51.24 | 73 |
| 2004 | 51 | 67 |
| 2003 | 50.76 | 60 |
| 2002 | 50.51 | 57 |
| 2001 | 50.24 | 53 |
| 2000 | 49.98 | 52 |
| 1999 | 49.71 | 47 |
| 1998 | 49.4 | 41 |
| 1997 | 49.07 | 38 |
| 1996 | 48.73 | 31 |
| 1995 | 48.38 | 26 |
| 1994 | 48.29 | 23 |
| 1993 | 48.28 | 22 |
| 1992 | 48.35 | 22 |
| 1991 | 48.42 | 22 |
| 1990 | 48.43 | 22 |
| 1989 | 48.72 | 24 |
| 1988 | 49.02 | 22 |
| 1987 | 49.35 | 21 |
| 1986 | 49.79 | 26 |