| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.77 | 36 |
| 2015 | 3.77 | 37 |
| 2014 | 3.78 | 36 |
| 2013 | 3.76 | 40 |
| 2012 | 3.7 | 42 |
| 2011 | 3.62 | 47 |
| 2010 | 3.51 | 51 |
| 2009 | 3.41 | 51 |
| 2008 | 3.42 | 56 |
| 2007 | 3.5 | 56 |
| 2006 | 3.61 | 50 |
| 2005 | 3.76 | 47 |
| 2004 | 3.9 | 43 |
| 2003 | 3.98 | 40 |
| 2002 | 3.98 | 43 |
| 2001 | 3.92 | 41 |
| 2000 | 3.82 | 42 |
| 1999 | 3.73 | 45 |
| 1998 | 3.64 | 51 |
| 1997 | 3.57 | 57 |
| 1996 | 3.53 | 59 |
| 1995 | 3.47 | 59 |
| 1994 | 3.4 | 61 |
| 1993 | 4.01 | 49 |
| 1992 | 4.19 | 49 |
| 1991 | 4.21 | 54 |
| 1990 | 4.23 | 53 |
| 1989 | 4.25 | 56 |
| 1988 | 4.23 | 63 |
| 1987 | 4.12 | 70 |
| 1986 | 3.96 | 77 |