| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 8.9 | 11 |
| 2015 | 7.6 | 27 |
| 2014 | 6 | 33 |
| 2013 | 6 | 41 |
| 2012 | 6.7 | 35 |
| 2011 | 5.6 | 42 |
| 2010 | 7.1 | 32 |
| 2009 | 7.4 | 36 |
| 2008 | 4.8 | 44 |
| 2007 | 5.3 | 47 |
| 2006 | 4.9 | 46 |
| 2005 | 4.7 | 44 |
| 2004 | 6.2 | 24 |
| 2003 | 6.3 | 27 |
| 2002 | 6.2 | 26 |
| 2001 | 4.7 | 38 |
| 2000 | 5.1 | 29 |
| 1999 | 5.6 | 28 |
| 1998 | 5.6 | 22 |
| 1997 | 6.2 | 10 |
| 1996 | 1.6 | 110 |
| 1995 | 2.8 | 64 |
| 1994 | 3.1 | 62 |
| 1993 | 2.1 | 84 |
| 1992 | 2.7 | 60 |
| 1991 | 1.9 | 81 |