| 时间 | 值 | 世界排名 |
|---|---|---|
| 2013 | 3.9 | 85 |
| 2012 | 4.1 | 80 |
| 2011 | 3.5 | 93 |
| 2010 | 3.3 | 115 |
| 2009 | 3.2 | 115 |
| 2008 | 2.1 | 113 |
| 2007 | 2.7 | 107 |
| 2006 | 3.4 | 77 |
| 2005 | 2.6 | 104 |
| 2004 | 2.4 | 108 |
| 2003 | 3.1 | 85 |
| 2002 | 2.9 | 81 |
| 2001 | 1.9 | 106 |
| 2000 | 1.6 | 121 |
| 1999 | 1.8 | 111 |
| 1998 | 1.7 | 108 |
| 1997 | 1.5 | 119 |
| 1996 | 1.5 | 116 |
| 1995 | 1.7 | 105 |
| 1994 | 1.4 | 107 |
| 1993 | 1.9 | 89 |
| 1992 | 1.8 | 88 |
| 1991 | 1.6 | 91 |
| 1990 | 1.2 | 98 |
| 1989 | 1.1 | 101 |
| 1988 | 1.6 | 86 |
| 1987 | 2.7 | 66 |
| 1986 | 1.6 | 90 |