| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 8.5 | 13 |
| 2015 | 7.9 | 25 |
| 2014 | 6.6 | 28 |
| 2013 | 6.2 | 39 |
| 2012 | 5.8 | 43 |
| 2011 | 5.4 | 45 |
| 2010 | 6.5 | 37 |
| 2009 | 7.8 | 31 |
| 2008 | 4.5 | 50 |
| 2007 | 6.9 | 28 |
| 2006 | 7.3 | 23 |
| 2005 | 7.6 | 18 |
| 2004 | 8.5 | 14 |
| 2003 | 8.3 | 14 |
| 2002 | 7.6 | 13 |
| 2001 | 6.8 | 13 |
| 2000 | 5.8 | 19 |
| 1999 | 6 | 22 |
| 1998 | 5.1 | 29 |
| 1997 | 1.4 | 122 |
| 1996 | 2.3 | 85 |
| 1995 | 2.5 | 72 |
| 1994 | 2.6 | 74 |
| 1993 | 2.5 | 69 |
| 1992 | 2.3 | 74 |
| 1991 | 1.8 | 82 |
| 1990 | 2.3 | 68 |
| 1989 | 2.8 | 62 |
| 1988 | 2.7 | 58 |
| 1987 | 1 | 106 |
| 1986 | 1.1 | 97 |