| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.76 | 37 |
| 2015 | 3.81 | 36 |
| 2014 | 3.86 | 35 |
| 2013 | 3.89 | 35 |
| 2012 | 3.92 | 34 |
| 2011 | 3.94 | 36 |
| 2010 | 3.96 | 36 |
| 2009 | 3.98 | 34 |
| 2008 | 4 | 37 |
| 2007 | 4 | 38 |
| 2006 | 3.99 | 39 |
| 2005 | 3.97 | 38 |
| 2004 | 3.95 | 40 |
| 2003 | 3.97 | 41 |
| 2002 | 4.05 | 39 |
| 2001 | 4.16 | 29 |
| 2000 | 4.32 | 24 |
| 1999 | 4.46 | 21 |
| 1998 | 4.52 | 22 |
| 1997 | 4.45 | 27 |
| 1996 | 4.27 | 31 |
| 1995 | 4.03 | 43 |
| 1994 | 3.82 | 51 |
| 1993 | 3.71 | 56 |
| 1992 | 3.76 | 59 |
| 1991 | 3.93 | 62 |
| 1990 | 4.15 | 56 |
| 1989 | 4.33 | 54 |
| 1988 | 4.53 | 50 |
| 1987 | 4.7 | 51 |
| 1986 | 4.84 | 47 |