| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 4.2 | 99 |
| 2015 | 4.7 | 94 |
| 2014 | 5.3 | 92 |
| 2013 | 5.3 | 92 |
| 2012 | 5.6 | 90 |
| 2011 | 6.1 | 94 |
| 2010 | 5.2 | 96 |
| 2009 | 4 | 99 |
| 2008 | 6.4 | 98 |
| 2007 | 5.7 | 97 |
| 2006 | 5 | 98 |
| 2005 | 5.2 | 96 |
| 2004 | 4.9 | 105 |
| 2003 | 6.8 | 100 |
| 2002 | 8.7 | 100 |
| 2001 | 9.2 | 100 |
| 2000 | 12.1 | 109 |
| 1999 | 11.7 | 107 |
| 1998 | 12.1 | 105 |
| 1997 | 12.5 | 105 |
| 1996 | 14.9 | 102 |
| 1995 | 17.9 | 87 |
| 1994 | 18.6 | 85 |
| 1993 | 15.1 | 87 |
| 1992 | 11 | 101 |
| 1991 | 13.4 | 92 |
| 1990 | 12.8 | 94 |
| 1989 | 14.5 | 91 |
| 1988 | 12.8 | 93 |
| 1987 | 11.6 | 93 |
| 1986 | 10.1 | 94 |