| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 5.2 | 31 |
| 2015 | 4.3 | 69 |
| 2014 | 4 | 74 |
| 2013 | 4.2 | 77 |
| 2012 | 4 | 83 |
| 2011 | 3.7 | 88 |
| 2010 | 4.3 | 89 |
| 2009 | 4.4 | 92 |
| 2008 | 3.3 | 74 |
| 2007 | 3.3 | 91 |
| 2006 | 3.5 | 74 |
| 2005 | 3.8 | 63 |
| 2004 | 3.9 | 63 |
| 2003 | 4.5 | 57 |
| 2002 | 3.9 | 65 |
| 2001 | 4.4 | 45 |
| 2000 | 3.6 | 56 |
| 1999 | 2.8 | 77 |
| 1998 | 3.1 | 62 |
| 1997 | 3.1 | 63 |
| 1996 | 3 | 64 |
| 1995 | 2.4 | 77 |
| 1994 | 3.3 | 54 |
| 1993 | 3.6 | 50 |
| 1992 | 3.2 | 52 |
| 1991 | 4.8 | 27 |
| 1990 | 2.1 | 74 |
| 1989 | 3 | 51 |
| 1988 | 2.6 | 63 |
| 1987 | 3.6 | 44 |
| 1986 | 5.2 | 25 |