| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 2 | 53 |
| 2015 | 1.8 | 116 |
| 2014 | 1.7 | 118 |
| 2013 | 1.6 | 138 |
| 2012 | 1.4 | 142 |
| 2011 | 1.4 | 139 |
| 2010 | 1.5 | 139 |
| 2009 | 1.8 | 140 |
| 2008 | 1.2 | 134 |
| 2007 | 1.1 | 141 |
| 2006 | 2.9 | 98 |
| 2005 | 2.6 | 102 |
| 2004 | 2.6 | 104 |
| 2003 | 2.9 | 86 |
| 2002 | 2.3 | 107 |
| 2001 | 2.3 | 95 |
| 2000 | 2.1 | 100 |
| 1999 | 2.5 | 90 |
| 1998 | 1.9 | 102 |
| 1997 | 2 | 98 |
| 1996 | 2 | 92 |
| 1995 | 1.9 | 96 |
| 1994 | 2.1 | 92 |
| 1993 | 2.5 | 74 |
| 1992 | 2.4 | 69 |
| 1991 | 3.4 | 50 |
| 1990 | 3.3 | 42 |
| 1989 | 2.9 | 54 |