| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 3.4 | 88 |
| 2014 | 4.1 | 72 |
| 2013 | 3.5 | 93 |
| 2012 | 5.3 | 51 |
| 2011 | 5.3 | 48 |
| 2010 | 7.3 | 31 |
| 2009 | 9.3 | 23 |
| 2008 | 6.9 | 23 |
| 2007 | 8.4 | 20 |
| 2006 | 7.3 | 24 |
| 2005 | 7.3 | 20 |
| 2004 | 5.8 | 28 |
| 2003 | 5.7 | 38 |
| 2002 | 5.3 | 42 |
| 2001 | 4.3 | 50 |
| 2000 | 6.3 | 15 |
| 1999 | 6.8 | 9 |
| 1998 | 5.7 | 20 |
| 1997 | 5.5 | 18 |
| 1996 | 5.9 | 14 |
| 1995 | 5.5 | 18 |
| 1994 | 5.6 | 23 |
| 1993 | 6.7 | 10 |
| 1992 | 5.7 | 14 |
| 1991 | 5.1 | 21 |
| 1990 | 5.7 | 16 |
| 1989 | 2.9 | 59 |
| 1988 | 4.8 | 19 |
| 1987 | 3.5 | 46 |
| 1986 | 4.5 | 32 |