| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 7.4 | 29 |
| 2014 | 6.5 | 29 |
| 2013 | 7.9 | 24 |
| 2012 | 6.7 | 33 |
| 2011 | 6.1 | 38 |
| 2010 | 6.6 | 36 |
| 2009 | 6.5 | 48 |
| 2008 | 4.2 | 54 |
| 2007 | 5.3 | 48 |
| 2006 | 5.3 | 36 |
| 2005 | 4.7 | 47 |
| 2004 | 5.1 | 42 |
| 2003 | 5.5 | 39 |
| 2002 | 5.3 | 40 |
| 2001 | 5.2 | 29 |
| 2000 | 4.5 | 37 |
| 1999 | 3.5 | 60 |
| 1998 | 3 | 65 |
| 1997 | 2.6 | 83 |
| 1996 | 2.7 | 71 |
| 1995 | 2.4 | 75 |
| 1994 | 2.3 | 83 |
| 1993 | 1.2 | 111 |