| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.83 | 23 |
| 2015 | 3.64 | 38 |
| 2014 | 3.73 | 42 |
| 2013 | 4.24 | 40 |
| 2012 | 4.68 | 37 |
| 2011 | 4.79 | 53 |
| 2010 | 4.83 | 50 |
| 2009 | 3.24 | 29 |
| 2008 | 4.59 | 56 |
| 2007 | 4.91 | 84 |
| 2006 | 4.07 | 95 |
| 2005 | 4.25 | 75 |
| 2004 | 3.59 | 98 |
| 2003 | 3.34 | 79 |
| 2002 | 3.06 | 66 |
| 2001 | 2.21 | 81 |
| 2000 | 3.47 | 80 |
| 1999 | -.61 | 146 |
| 1998 | -14.35 | 192 |
| 1997 | 3.2 | 82 |
| 1996 | 6.22 | 31 |
| 1995 | 6.56 | 25 |
| 1994 | 5.84 | 24 |
| 1993 | 4.76 | 29 |
| 1992 | 4.71 | 38 |
| 1991 | 5.07 | 23 |
| 1990 | 5.35 | 25 |
| 1989 | 5.51 | 32 |
| 1988 | 3.8 | 63 |
| 1987 | 2.89 | 60 |
| 1986 | 3.74 | 39 |