| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 1.9 | 113 |
| 2014 | 4 | 73 |
| 2013 | 4.3 | 75 |
| 2012 | 3.9 | 87 |
| 2011 | 4.5 | 57 |
| 2010 | 6.4 | 39 |
| 2009 | 7.2 | 40 |
| 2008 | 5.2 | 37 |
| 2007 | 4.7 | 55 |
| 2006 | 3.4 | 79 |
| 2005 | 3.5 | 70 |
| 2004 | 3.1 | 86 |
| 2003 | 4.2 | 63 |
| 2002 | 4.4 | 58 |
| 2001 | 1.3 | 123 |
| 2000 | 2.7 | 77 |
| 1999 | 4.8 | 40 |
| 1998 | 4.8 | 34 |
| 1997 | 9.6 | 5 |
| 1996 | 11 | 3 |
| 1995 | 9.2 | 3 |
| 1994 | 8.9 | 7 |
| 1993 | 6.6 | 11 |
| 1992 | 6.2 | 11 |
| 1991 | 4.9 | 23 |
| 1990 | 3.9 | 30 |
| 1989 | 4.7 | 22 |
| 1988 | 3 | 50 |
| 1987 | 2.6 | 69 |
| 1986 | 3.1 | 54 |