| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 4.5 | 64 |
| 2014 | 3.1 | 96 |
| 2013 | 1.7 | 132 |
| 2012 | 3.1 | 109 |
| 2011 | 4.2 | 73 |
| 2010 | 4.7 | 78 |
| 2009 | 4.1 | 99 |
| 2008 | 2 | 114 |
| 2007 | 4.4 | 62 |
| 2006 | 4 | 66 |
| 2005 | 4.1 | 53 |
| 2004 | 5.2 | 39 |
| 2003 | 8 | 16 |
| 2002 | 7 | 18 |
| 2001 | 3.6 | 60 |
| 2000 | 1.7 | 114 |
| 1999 | 1.9 | 109 |
| 1998 | 1.4 | 118 |
| 1997 | 1.4 | 124 |
| 1996 | 0.9 | 134 |
| 1995 | 1.9 | 98 |
| 1994 | 3.3 | 55 |
| 1993 | 1.8 | 94 |
| 1992 | 1.3 | 108 |
| 1991 | 1.2 | 108 |
| 1990 | 1.1 | 103 |
| 1989 | 1.5 | 89 |
| 1988 | 1.5 | 89 |
| 1987 | 2 | 81 |
| 1986 | 2.2 | 76 |