| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.204 | 36 |
| 2015 | 51.17 | 37 |
| 2014 | 51.135 | 38 |
| 2013 | 51.1 | 42 |
| 2012 | 51.064 | 44 |
| 2011 | 51.028 | 45 |
| 2010 | 50.992 | 47 |
| 2009 | 50.958 | 50 |
| 2008 | 50.924 | 54 |
| 2007 | 50.89 | 59 |
| 2006 | 50.855 | 61 |
| 2005 | 50.818 | 63 |
| 2004 | 50.781 | 65 |
| 2003 | 50.744 | 69 |
| 2002 | 50.704 | 74 |
| 2001 | 50.66 | 77 |
| 2000 | 50.609 | 78 |
| 1999 | 50.548 | 86 |
| 1998 | 50.479 | 95 |
| 1997 | 50.412 | 101 |
| 1996 | 50.361 | 105 |
| 1995 | 50.335 | 106 |
| 1994 | 50.342 | 103 |
| 1993 | 50.377 | 102 |
| 1992 | 50.424 | 98 |
| 1991 | 50.459 | 93 |
| 1990 | 50.467 | 93 |
| 1989 | 50.439 | 94 |
| 1988 | 50.382 | 99 |
| 1987 | 50.303 | 104 |
| 1986 | 50.221 | 110 |