| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53.899 | 4 |
| 2015 | 53.779 | 5 |
| 2014 | 53.656 | 5 |
| 2013 | 53.529 | 6 |
| 2012 | 53.395 | 7 |
| 2011 | 53.247 | 8 |
| 2010 | 53.081 | 9 |
| 2009 | 52.895 | 9 |
| 2008 | 52.694 | 9 |
| 2007 | 52.478 | 11 |
| 2006 | 52.252 | 14 |
| 2005 | 52.02 | 16 |
| 2004 | 51.784 | 20 |
| 2003 | 51.547 | 26 |
| 2002 | 51.312 | 35 |
| 2001 | 51.083 | 48 |
| 2000 | 50.862 | 62 |
| 1999 | 50.648 | 75 |
| 1998 | 50.441 | 100 |
| 1997 | 50.241 | 114 |
| 1996 | 50.053 | 127 |
| 1995 | 49.88 | 132 |
| 1994 | 49.729 | 141 |
| 1993 | 49.597 | 154 |
| 1992 | 49.478 | 157 |
| 1991 | 49.362 | 161 |
| 1990 | 49.238 | 163 |
| 1989 | 49.107 | 166 |
| 1988 | 48.973 | 167 |
| 1987 | 48.83 | 170 |
| 1986 | 48.674 | 172 |