| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.56 | 13 |
| 2015 | 3.54 | 17 |
| 2014 | 3.48 | 22 |
| 2013 | 3.47 | 20 |
| 2012 | 3.48 | 18 |
| 2011 | 3.29 | 22 |
| 2010 | 3.42 | 21 |
| 2009 | 3.27 | 27 |
| 2008 | 3.46 | 18 |
| 2007 | 3.51 | 16 |
| 2006 | 3.65 | 15 |
| 2005 | 4.2 | 14 |
| 2004 | 4.26 | 15 |
| 2003 | 4.41 | 16 |
| 2002 | 4.39 | 16 |
| 2001 | 4.18 | 19 |
| 2000 | 4.17 | 20 |
| 1999 | 5.19 | 14 |
| 1998 | 5.42 | 13 |
| 1997 | 5.62 | 13 |
| 1996 | 6.04 | 9 |
| 1995 | 6.22 | 10 |
| 1994 | 6.5 | 12 |
| 1993 | 6.98 | 12 |
| 1992 | 7.05 | 12 |
| 1991 | 7.18 | 10 |
| 1990 | 7.13 | 12 |
| 1989 | 6.89 | 12 |
| 1988 | 7.26 | 11 |
| 1987 | 7.6 | 10 |
| 1986 | 7.39 | 7 |