| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 6.1 | 20 |
| 2015 | 5.8 | 41 |
| 2014 | 4.6 | 57 |
| 2013 | 4.6 | 65 |
| 2012 | 3.5 | 99 |
| 2011 | 2.8 | 114 |
| 2010 | 3.8 | 102 |
| 2009 | 4.2 | 98 |
| 2008 | 3.4 | 69 |
| 2007 | 4 | 71 |
| 2006 | 3.5 | 73 |
| 2005 | 3 | 85 |
| 2004 | 2.5 | 105 |
| 2003 | 2 | 113 |
| 2002 | 2.2 | 111 |
| 2001 | 1.5 | 118 |
| 2000 | 1 | 130 |
| 1999 | 1.4 | 124 |
| 1998 | 0.3 | 141 |
| 1997 | 0.8 | 137 |
| 1996 | 1.2 | 121 |
| 1995 | 1.5 | 113 |
| 1994 | 2.2 | 89 |
| 1993 | 3.7 | 47 |
| 1992 | 4.6 | 26 |
| 1991 | 5.1 | 22 |
| 1990 | 6 | 14 |
| 1989 | 6.3 | 12 |
| 1988 | 7.8 | 7 |
| 1987 | 8.2 | 9 |
| 1986 | 6.3 | 14 |