| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 2.2 | 110 |
| 2014 | 2.4 | 110 |
| 2013 | 1.7 | 134 |
| 2012 | 1.6 | 140 |
| 2011 | 1.6 | 135 |
| 2010 | 2.2 | 133 |
| 2009 | 1.9 | 138 |
| 2008 | 1.2 | 132 |
| 2007 | 1.9 | 129 |
| 2006 | 2.6 | 112 |
| 2005 | 2.5 | 108 |
| 2004 | 3.2 | 84 |
| 2003 | 3.4 | 79 |
| 2002 | 3.3 | 75 |
| 2001 | 2.3 | 93 |
| 2000 | 3 | 67 |
| 1999 | 3 | 72 |
| 1998 | 3.2 | 61 |
| 1997 | 2.7 | 79 |
| 1996 | 2.4 | 82 |
| 1995 | 1.7 | 104 |
| 1994 | 1.3 | 109 |
| 1993 | 1.2 | 112 |
| 1992 | 1.4 | 102 |
| 1991 | 1.4 | 100 |
| 1990 | 1.6 | 83 |
| 1989 | 1.9 | 79 |
| 1988 | 2 | 76 |
| 1987 | 0.9 | 109 |
| 1986 | 0.8 | 105 |