| 时间 | 值 | 世界排名 |
|---|---|---|
| 2014 | 5.4 | 43 |
| 2013 | 4.8 | 57 |
| 2012 | 5.6 | 44 |
| 2011 | 5.3 | 46 |
| 2010 | 6.1 | 43 |
| 2009 | 6.2 | 51 |
| 2008 | 4.8 | 43 |
| 2007 | 4.4 | 63 |
| 2006 | 2.8 | 101 |
| 2005 | 2.8 | 90 |
| 2004 | 3.3 | 76 |
| 2003 | 3.5 | 73 |
| 2002 | 3.7 | 69 |
| 2001 | 3.2 | 69 |
| 2000 | 3 | 68 |
| 1999 | 3 | 74 |
| 1998 | 3.5 | 54 |
| 1997 | 2.7 | 77 |
| 1996 | 2.3 | 86 |
| 1995 | 1.6 | 107 |
| 1994 | 1.5 | 102 |
| 1993 | 0.5 | 131 |