| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 6.9 | 34 |
| 2014 | 5.6 | 39 |
| 2013 | 4.9 | 55 |
| 2012 | 3.9 | 88 |
| 2011 | 2.8 | 115 |
| 2010 | 4.3 | 87 |
| 2009 | 5.1 | 74 |
| 2008 | 2.6 | 98 |
| 2007 | 3 | 96 |
| 2006 | 2.6 | 109 |
| 2005 | 2.1 | 113 |
| 2004 | 2.9 | 94 |
| 2003 | 2.8 | 90 |
| 2002 | 2.2 | 113 |
| 2001 | 1.6 | 116 |
| 2000 | 1.8 | 109 |
| 1999 | 2.1 | 103 |
| 1998 | 2.8 | 72 |
| 1997 | 2.4 | 89 |
| 1996 | 2.9 | 65 |
| 1995 | 3.7 | 43 |
| 1994 | 6.8 | 14 |
| 1993 | 6.2 | 14 |
| 1992 | 5.2 | 19 |
| 1991 | 4 | 35 |
| 1990 | 1.9 | 77 |
| 1989 | 1.5 | 90 |
| 1988 | 3.7 | 36 |
| 1987 | 3.4 | 50 |
| 1986 | 1.8 | 89 |