| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 4.3 | 68 |
| 2014 | 3.5 | 84 |
| 2013 | 3.7 | 91 |
| 2012 | 4 | 85 |
| 2011 | 3.7 | 87 |
| 2010 | 4 | 96 |
| 2009 | 3.8 | 107 |
| 2008 | 1.4 | 129 |
| 2007 | 2.8 | 104 |
| 2006 | 1.7 | 128 |
| 2005 | 1.9 | 121 |
| 2004 | 3 | 89 |
| 2003 | 3.3 | 81 |
| 2002 | 3.8 | 68 |
| 2001 | 3.8 | 54 |
| 2000 | 4.4 | 42 |
| 1999 | 4.6 | 44 |
| 1998 | 4.3 | 40 |
| 1997 | 3.3 | 60 |
| 1996 | 3.8 | 42 |
| 1995 | 3.3 | 48 |
| 1994 | 2.8 | 72 |
| 1993 | 3.1 | 61 |
| 1992 | 4.1 | 31 |
| 1991 | 3.6 | 44 |
| 1990 | 3.2 | 44 |
| 1989 | 3.2 | 46 |
| 1988 | 4.4 | 22 |
| 1987 | 2.9 | 60 |
| 1986 | 3.6 | 44 |