| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 3 | 44 |
| 2015 | 2.9 | 97 |
| 2014 | 2.7 | 103 |
| 2013 | 2.9 | 112 |
| 2012 | 2.3 | 130 |
| 2011 | 2.1 | 128 |
| 2010 | 2.4 | 127 |
| 2009 | 2.7 | 122 |
| 2008 | 1.3 | 131 |
| 2007 | 1.4 | 134 |
| 2006 | 1.6 | 130 |
| 2005 | 1.6 | 127 |
| 2004 | 1.8 | 117 |
| 2003 | 2 | 111 |
| 2002 | 2.1 | 117 |
| 2001 | 1.8 | 110 |
| 2000 | 1.7 | 117 |
| 1999 | 1.8 | 110 |
| 1998 | 1.7 | 109 |
| 1997 | 1.4 | 123 |
| 1996 | 2.3 | 83 |
| 1995 | 3 | 56 |
| 1994 | 3.8 | 46 |
| 1993 | 3.6 | 51 |
| 1992 | 3.4 | 40 |
| 1991 | 3 | 59 |
| 1990 | 2.9 | 55 |
| 1989 | 2 | 75 |
| 1988 | 2.1 | 74 |
| 1987 | 2.4 | 73 |
| 1986 | 2.4 | 73 |