| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 4.2 | 72 |
| 2014 | 3.5 | 86 |
| 2013 | 3.8 | 89 |
| 2012 | 3.7 | 91 |
| 2011 | 4 | 79 |
| 2010 | 5 | 71 |
| 2009 | 5.1 | 75 |
| 2008 | 3 | 85 |
| 2007 | 4.3 | 64 |
| 2006 | 4.2 | 63 |
| 2005 | 4.9 | 40 |
| 2004 | 5.5 | 32 |
| 2003 | 5 | 48 |
| 2002 | 4.9 | 50 |
| 2001 | 5.3 | 27 |
| 2000 | 4.2 | 46 |
| 1999 | 3.9 | 56 |
| 1998 | 2.2 | 91 |
| 1997 | 2.6 | 82 |
| 1996 | 1.6 | 114 |
| 1995 | 2.1 | 89 |
| 1994 | 0.6 | 134 |
| 1993 | 1.2 | 114 |