| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 7.6 | 14 |
| 2015 | 7 | 32 |
| 2014 | 8 | 21 |
| 2013 | 8.1 | 23 |
| 2012 | 8.5 | 18 |
| 2011 | 8.3 | 21 |
| 2010 | 8.1 | 25 |
| 2009 | 8.3 | 30 |
| 2008 | 5.5 | 34 |
| 2007 | 6.1 | 35 |
| 2006 | 6 | 32 |
| 2005 | 5 | 37 |
| 2004 | 5.4 | 34 |
| 2003 | 6.1 | 29 |
| 2002 | 8.4 | 10 |
| 2001 | 9.8 | 5 |
| 2000 | 7.8 | 7 |
| 1999 | 5.2 | 34 |
| 1998 | 3.9 | 48 |
| 1997 | 3.5 | 57 |
| 1996 | 3.7 | 43 |
| 1995 | 3.9 | 37 |
| 1994 | 4.4 | 37 |
| 1993 | 5.1 | 23 |
| 1992 | 5.8 | 13 |
| 1991 | 4.8 | 28 |
| 1990 | 4.4 | 26 |
| 1989 | 4.4 | 25 |
| 1988 | 3.3 | 44 |
| 1987 | 6.7 | 12 |
| 1986 | 8 | 9 |