| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 8.9 | 10 |
| 2015 | 9.9 | 17 |
| 2014 | 9.9 | 16 |
| 2013 | 11.6 | 12 |
| 2012 | 11.5 | 13 |
| 2011 | 11.6 | 12 |
| 2010 | 10.4 | 19 |
| 2009 | 9.2 | 25 |
| 2008 | 6.4 | 26 |
| 2007 | 6.7 | 29 |
| 2006 | 5.1 | 43 |
| 2005 | 4.6 | 48 |
| 2004 | 4.4 | 53 |
| 2003 | 5 | 47 |
| 2002 | 5.1 | 44 |
| 2001 | 5.1 | 32 |
| 2000 | 4.7 | 34 |
| 1999 | 5.2 | 35 |
| 1998 | 3.1 | 63 |
| 1997 | 2 | 101 |
| 1996 | 3.2 | 59 |
| 1995 | 2.6 | 69 |
| 1994 | 3.1 | 61 |
| 1993 | 3.2 | 60 |
| 1992 | 3.3 | 45 |
| 1991 | 3.3 | 53 |
| 1990 | 1.5 | 88 |
| 1989 | 2 | 77 |
| 1988 | 2.2 | 69 |
| 1987 | 2.7 | 63 |
| 1986 | 3.9 | 41 |