| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 12 | 83 |
| 2015 | 25.6 | 74 |
| 2014 | 31.1 | 73 |
| 2013 | 34.6 | 68 |
| 2012 | 25 | 70 |
| 2011 | 21.3 | 74 |
| 2010 | 23.8 | 74 |
| 2009 | 14.3 | 80 |
| 2008 | 12.2 | 85 |
| 2007 | 23.9 | 76 |
| 2006 | 18.8 | 79 |
| 2005 | 15.4 | 85 |
| 2004 | 12.7 | 91 |
| 2003 | 9.7 | 98 |
| 2002 | 10.9 | 98 |
| 2001 | 10.2 | 99 |
| 2000 | 27.3 | 84 |
| 1999 | 27.9 | 81 |
| 1998 | 28.9 | 79 |
| 1997 | 29 | 81 |
| 1996 | 25.2 | 78 |
| 1995 | 31.5 | 74 |
| 1994 | 23.6 | 79 |
| 1993 | 27.1 | 69 |
| 1992 | 27.5 | 72 |
| 1991 | 26.1 | 66 |
| 1990 | 30.2 | 66 |
| 1989 | 29 | 66 |
| 1988 | 23.4 | 70 |
| 1987 | 21 | 72 |
| 1986 | 19.2 | 69 |