| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.477 | 28 |
| 2015 | 51.482 | 29 |
| 2014 | 51.473 | 29 |
| 2013 | 51.449 | 30 |
| 2012 | 51.405 | 31 |
| 2011 | 51.33 | 33 |
| 2010 | 51.221 | 37 |
| 2009 | 51.071 | 44 |
| 2008 | 50.884 | 59 |
| 2007 | 50.686 | 70 |
| 2006 | 50.51 | 87 |
| 2005 | 50.381 | 101 |
| 2004 | 50.316 | 105 |
| 2003 | 50.308 | 106 |
| 2002 | 50.326 | 106 |
| 2001 | 50.324 | 104 |
| 2000 | 50.27 | 111 |
| 1999 | 50.142 | 120 |
| 1998 | 49.953 | 133 |
| 1997 | 49.747 | 143 |
| 1996 | 49.588 | 152 |
| 1995 | 49.527 | 155 |
| 1994 | 49.591 | 153 |
| 1993 | 49.766 | 141 |
| 1992 | 50.005 | 129 |
| 1991 | 50.231 | 116 |
| 1990 | 50.38 | 103 |
| 1989 | 50.425 | 95 |
| 1988 | 50.379 | 100 |
| 1987 | 50.271 | 108 |
| 1986 | 50.149 | 117 |