| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 12.5 | 11 |
| 2014 | 8.4 | 19 |
| 2013 | 8.6 | 21 |
| 2012 | 7.6 | 25 |
| 2011 | 6.7 | 31 |
| 2010 | 6 | 45 |
| 2009 | 6.6 | 45 |
| 2008 | 6.6 | 25 |
| 2007 | 6.5 | 32 |
| 2006 | 7.7 | 21 |
| 2005 | 6.7 | 24 |
| 2004 | 7.7 | 15 |
| 2003 | 7.7 | 17 |
| 2002 | 7.4 | 15 |
| 2001 | 7.4 | 11 |
| 2000 | 6.5 | 13 |
| 1999 | 6.2 | 18 |
| 1998 | 6.6 | 11 |
| 1997 | 4.1 | 39 |
| 1996 | 4.3 | 34 |
| 1995 | 4.7 | 29 |
| 1994 | 6.1 | 16 |
| 1993 | 7.4 | 8 |
| 1992 | 6.3 | 10 |
| 1991 | 5.7 | 15 |
| 1990 | 5 | 18 |
| 1989 | 4.5 | 24 |
| 1988 | 4.1 | 28 |
| 1987 | 4.6 | 30 |
| 1986 | 3.2 | 51 |