| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.27 | 45 |
| 2015 | 3.37 | 46 |
| 2014 | 3.46 | 46 |
| 2013 | 3.53 | 46 |
| 2012 | 3.59 | 45 |
| 2011 | 3.63 | 46 |
| 2010 | 3.62 | 47 |
| 2009 | 3.63 | 45 |
| 2008 | 3.68 | 45 |
| 2007 | 3.79 | 44 |
| 2006 | 3.95 | 42 |
| 2005 | 4.12 | 33 |
| 2004 | 4.29 | 33 |
| 2003 | 4.44 | 26 |
| 2002 | 4.54 | 23 |
| 2001 | 4.02 | 40 |
| 2000 | 3.62 | 51 |
| 1999 | 3.69 | 47 |
| 1998 | 3.75 | 47 |
| 1997 | 3.79 | 50 |
| 1996 | 3.83 | 51 |
| 1995 | 3.85 | 50 |
| 1994 | 3.88 | 50 |
| 1993 | 3.91 | 52 |
| 1992 | 4 | 54 |
| 1991 | 4.59 | 41 |
| 1990 | 4.93 | 33 |
| 1989 | 5.03 | 33 |
| 1988 | 5.13 | 38 |
| 1987 | 5.18 | 38 |
| 1986 | 5.2 | 42 |