| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 11.3 | 7 |
| 2015 | 11.2 | 14 |
| 2014 | 9.7 | 17 |
| 2013 | 9.3 | 16 |
| 2012 | 8.5 | 19 |
| 2011 | 8.6 | 18 |
| 2010 | 9.6 | 21 |
| 2009 | 9.8 | 21 |
| 2008 | 5.3 | 36 |
| 2007 | 4 | 70 |
| 2006 | 4.9 | 48 |
| 2005 | 5.2 | 35 |
| 2004 | 5.4 | 35 |
| 2003 | 6.1 | 32 |
| 2002 | 5.8 | 31 |
| 2001 | 5.4 | 25 |
| 2000 | 4.8 | 32 |
| 1999 | 5.6 | 29 |
| 1998 | 6.4 | 12 |
| 1997 | 5.7 | 16 |
| 1996 | 3.2 | 58 |
| 1995 | 2.5 | 74 |
| 1994 | 2.4 | 82 |
| 1993 | 2.5 | 70 |
| 1992 | 2.2 | 76 |
| 1991 | 3 | 60 |
| 1990 | 3.3 | 39 |
| 1989 | 3.3 | 43 |
| 1988 | 2.6 | 61 |
| 1987 | 3.9 | 39 |
| 1986 | 3.9 | 40 |