| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 6.3 | 40 |
| 2014 | 5 | 50 |
| 2013 | 4.8 | 61 |
| 2012 | 4.6 | 64 |
| 2011 | 4.5 | 58 |
| 2010 | 4.5 | 84 |
| 2009 | 5.2 | 70 |
| 2008 | 2.8 | 93 |
| 2007 | 4.6 | 60 |
| 2006 | 4.6 | 53 |
| 2005 | 3.1 | 79 |
| 2004 | 3.3 | 77 |
| 2003 | 2.8 | 91 |
| 2002 | 2.7 | 89 |
| 2001 | 2.6 | 81 |
| 2000 | 2.6 | 81 |
| 1999 | 2.7 | 84 |
| 1998 | 3.3 | 59 |
| 1997 | 2.8 | 76 |
| 1996 | 3.2 | 60 |
| 1995 | 3.5 | 44 |
| 1994 | 3.4 | 52 |
| 1993 | 4 | 43 |
| 1992 | 3.6 | 39 |
| 1991 | 3.2 | 55 |
| 1990 | 3.3 | 40 |
| 1989 | 4 | 32 |
| 1988 | 4.2 | 26 |
| 1987 | 3.9 | 40 |
| 1986 | 2.3 | 75 |