| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.28 | 16 |
| 2015 | 4.53 | 12 |
| 2014 | 4.76 | 15 |
| 2013 | 4.89 | 16 |
| 2012 | 4.83 | 16 |
| 2011 | 4.64 | 22 |
| 2010 | 4.35 | 29 |
| 2009 | 4.09 | 32 |
| 2008 | 4.02 | 36 |
| 2007 | 4.25 | 30 |
| 2006 | 4.71 | 21 |
| 2005 | 5.34 | 16 |
| 2004 | 5.92 | 9 |
| 2003 | 6.28 | 8 |
| 2002 | 6.19 | 5 |
| 2001 | 5.72 | 9 |
| 2000 | 4.97 | 13 |
| 1999 | 4.31 | 24 |
| 1998 | 4.08 | 32 |
| 1997 | 4.58 | 24 |
| 1996 | 5.64 | 7 |
| 1995 | 7.08 | 2 |
| 1994 | 8.41 | 2 |
| 1993 | 9.18 | 1 |
| 1992 | 8.85 | 1 |
| 1991 | 7.42 | 4 |
| 1990 | 5.45 | 22 |
| 1989 | 3.57 | 76 |
| 1988 | 1.87 | 137 |
| 1987 | 0.69 | 181 |
| 1986 | -.01 | 199 |