| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 5.5 | 49 |
| 2014 | 5.7 | 37 |
| 2013 | 6.7 | 33 |
| 2012 | 7 | 32 |
| 2011 | 6.9 | 28 |
| 2010 | 6.3 | 42 |
| 2009 | 7.2 | 39 |
| 2008 | 5.6 | 33 |
| 2007 | 6.7 | 30 |
| 2006 | 6.2 | 29 |
| 2005 | 5.9 | 28 |
| 2004 | 6.2 | 26 |
| 2003 | 5 | 50 |
| 2002 | 4 | 62 |
| 2001 | 3.8 | 55 |
| 2000 | 3.3 | 63 |
| 1999 | 4.4 | 47 |
| 1998 | 4.3 | 39 |
| 1997 | 2.6 | 84 |
| 1996 | 3.4 | 53 |
| 1995 | 3.2 | 52 |
| 1994 | 4.3 | 39 |
| 1993 | 5.8 | 15 |
| 1992 | 4.4 | 28 |
| 1991 | 3.2 | 54 |
| 1990 | 3.6 | 33 |
| 1989 | 3.7 | 37 |
| 1988 | 3.9 | 30 |
| 1987 | 5.6 | 21 |
| 1986 | 5.1 | 27 |