| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 6.4 | 18 |
| 2015 | 4.9 | 56 |
| 2014 | 3.7 | 79 |
| 2013 | 4 | 80 |
| 2012 | 3.2 | 107 |
| 2011 | 2.8 | 116 |
| 2010 | 3.4 | 111 |
| 2009 | 3.8 | 108 |
| 2008 | 2.7 | 96 |
| 2007 | 2.9 | 97 |
| 2006 | 3.4 | 80 |
| 2005 | 3.9 | 60 |
| 2004 | 4.5 | 52 |
| 2003 | 5.8 | 36 |
| 2002 | 6.4 | 23 |
| 2001 | 4.5 | 43 |
| 2000 | 4.6 | 36 |
| 1999 | 4.9 | 39 |
| 1998 | 4.8 | 33 |
| 1997 | 4 | 42 |
| 1996 | 5.1 | 24 |
| 1995 | 6.5 | 10 |
| 1994 | 4.1 | 41 |
| 1993 | 3.1 | 62 |