| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 5.3 | 50 |
| 2014 | 5.1 | 48 |
| 2013 | 6.8 | 30 |
| 2012 | 6.2 | 38 |
| 2011 | 5.1 | 50 |
| 2010 | 5.3 | 63 |
| 2009 | 4.5 | 89 |
| 2008 | 2.9 | 89 |
| 2007 | 2.9 | 99 |
| 2006 | 2 | 121 |
| 2005 | 1.4 | 133 |
| 2004 | 1.4 | 126 |
| 2003 | 0.5 | 142 |
| 2002 | 0.8 | 139 |
| 2001 | 1.3 | 125 |
| 2000 | 1.6 | 119 |
| 1999 | 2.5 | 89 |
| 1998 | 3 | 66 |
| 1997 | 2.8 | 73 |
| 1996 | 3.4 | 54 |
| 1995 | 2.9 | 62 |
| 1994 | 2.8 | 68 |
| 1993 | 1.6 | 98 |
| 1992 | 1.5 | 97 |
| 1991 | 0.9 | 116 |
| 1990 | 0.2 | 117 |
| 1989 | 0.5 | 110 |
| 1988 | 0.5 | 115 |
| 1987 | 0.6 | 111 |
| 1986 | 0.6 | 113 |