| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 4.3 | 37 |
| 2015 | 4.7 | 61 |
| 2014 | 4.4 | 65 |
| 2013 | 4.7 | 62 |
| 2012 | 4.5 | 66 |
| 2011 | 3.4 | 99 |
| 2010 | 3.9 | 100 |
| 2009 | 4.1 | 102 |
| 2008 | 2.9 | 91 |
| 2007 | 3.7 | 80 |
| 2006 | 3.2 | 87 |
| 2005 | 2.7 | 91 |
| 2004 | 2.6 | 102 |
| 2003 | 2.7 | 96 |
| 2002 | 2.3 | 108 |
| 2001 | 2.2 | 99 |
| 2000 | 2.1 | 97 |
| 1999 | 2.4 | 93 |
| 1998 | 2.1 | 94 |
| 1997 | 3 | 70 |
| 1996 | 2.6 | 75 |
| 1995 | 2.9 | 58 |
| 1994 | 2.8 | 69 |
| 1993 | 3.3 | 54 |
| 1992 | 3.8 | 34 |
| 1991 | 4.4 | 31 |
| 1990 | 2.3 | 69 |
| 1989 | 3.5 | 41 |
| 1988 | 3.9 | 31 |
| 1987 | 3.2 | 55 |
| 1986 | 4 | 38 |