| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 5.1 | 53 |
| 2014 | 4.2 | 71 |
| 2013 | 3.4 | 95 |
| 2012 | 5.2 | 53 |
| 2011 | 6.7 | 32 |
| 2010 | 5.4 | 59 |
| 2009 | 5.9 | 57 |
| 2008 | 4.2 | 53 |
| 2007 | 4.7 | 57 |
| 2006 | 3.9 | 67 |
| 2005 | 2.7 | 95 |
| 2004 | 2.6 | 101 |
| 2003 | 2.4 | 101 |
| 2002 | 1.9 | 121 |
| 2001 | 2.9 | 77 |
| 2000 | 1.8 | 110 |
| 1999 | 1.3 | 126 |
| 1998 | 1.2 | 125 |
| 1997 | 1.7 | 113 |
| 1996 | 2.6 | 74 |
| 1995 | 1.3 | 117 |
| 1994 | 0.6 | 133 |
| 1993 | 0.9 | 125 |
| 1992 | 1.3 | 110 |
| 1991 | 1.8 | 83 |
| 1990 | 3 | 53 |
| 1989 | 2.4 | 65 |
| 1988 | 2.3 | 67 |
| 1987 | 3.2 | 54 |
| 1986 | 3.7 | 43 |