| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 5.5 | 25 |
| 2015 | 4.8 | 58 |
| 2014 | 4.4 | 63 |
| 2013 | 4.3 | 74 |
| 2012 | 4.3 | 73 |
| 2011 | 4.2 | 70 |
| 2010 | 4.5 | 83 |
| 2009 | 5.1 | 71 |
| 2008 | 3.3 | 73 |
| 2007 | 3.5 | 86 |
| 2006 | 3.2 | 85 |
| 2005 | 3.2 | 75 |
| 2004 | 2.7 | 100 |
| 2003 | 1.9 | 114 |
| 2002 | 2.5 | 98 |
| 2001 | 2.5 | 85 |
| 2000 | 2.4 | 88 |
| 1999 | 2.5 | 86 |
| 1998 | 1.8 | 106 |
| 1997 | 1.8 | 106 |
| 1996 | 0.7 | 138 |
| 1995 | 1.4 | 114 |
| 1994 | 1.3 | 110 |
| 1993 | 1.3 | 109 |
| 1992 | 1.5 | 100 |
| 1991 | 1.5 | 92 |
| 1990 | 1.2 | 99 |
| 1989 | 1.1 | 102 |
| 1988 | 1 | 105 |
| 1987 | 1.9 | 84 |
| 1986 | 1.5 | 94 |