| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.77 | 34 |
| 2015 | 3.89 | 34 |
| 2014 | 3.99 | 32 |
| 2013 | 4.07 | 32 |
| 2012 | 4.11 | 30 |
| 2011 | 4.12 | 32 |
| 2010 | 4.11 | 32 |
| 2009 | 4.11 | 30 |
| 2008 | 4.12 | 34 |
| 2007 | 4.16 | 33 |
| 2006 | 4.21 | 30 |
| 2005 | 4.27 | 32 |
| 2004 | 4.33 | 31 |
| 2003 | 4.4 | 27 |
| 2002 | 4.48 | 24 |
| 2001 | 4.57 | 21 |
| 2000 | 4.66 | 18 |
| 1999 | 4.74 | 17 |
| 1998 | 4.78 | 16 |
| 1997 | 4.77 | 18 |
| 1996 | 4.71 | 20 |
| 1995 | 4.63 | 23 |
| 1994 | 4.56 | 29 |
| 1993 | 4.5 | 34 |
| 1992 | 4.5 | 38 |
| 1991 | 4.54 | 43 |
| 1990 | 4.59 | 44 |
| 1989 | 4.63 | 45 |
| 1988 | 6.53 | 13 |
| 1987 | 7.23 | 10 |
| 1986 | 7.37 | 10 |