| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 16.8 | 5 |
| 2015 | 18 | 3 |
| 2014 | 19 | 3 |
| 2013 | 19.5 | 4 |
| 2012 | 19.1 | 4 |
| 2011 | 19.1 | 5 |
| 2010 | 22.6 | 4 |
| 2009 | 25.7 | 4 |
| 2008 | 19.2 | 4 |
| 2007 | 18.1 | 5 |
| 2006 | 15.4 | 6 |
| 2005 | 14.2 | 7 |
| 2004 | 12.9 | 4 |
| 2003 | 11.4 | 6 |
| 2002 | 15.3 | 3 |
| 2001 | 12.6 | 3 |
| 2000 | 10.9 | 3 |
| 1999 | 13.6 | 3 |
| 1998 | 15.3 | 3 |
| 1997 | 15.4 | 2 |
| 1996 | 7.7 | 9 |
| 1995 | 6.3 | 13 |
| 1994 | 5.9 | 20 |
| 1993 | 3.2 | 58 |
| 1992 | 3.8 | 35 |
| 1991 | 10.1 | 4 |
| 1990 | 8.5 | 6 |
| 1989 | 5.1 | 18 |
| 1988 | 5.5 | 12 |
| 1987 | 6.7 | 13 |
| 1986 | 5.2 | 26 |