| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.19 | 49 |
| 2015 | 3.23 | 51 |
| 2014 | 3.25 | 51 |
| 2013 | 3.26 | 52 |
| 2012 | 3.25 | 55 |
| 2011 | 3.21 | 55 |
| 2010 | 3.17 | 59 |
| 2009 | 3.13 | 57 |
| 2008 | 3.09 | 65 |
| 2007 | 3.07 | 67 |
| 2006 | 3.05 | 72 |
| 2005 | 3.03 | 71 |
| 2004 | 3.02 | 68 |
| 2003 | 3.02 | 66 |
| 2002 | 3.04 | 68 |
| 2001 | 3.07 | 66 |
| 2000 | 3.13 | 66 |
| 1999 | 3.18 | 64 |
| 1998 | 3.21 | 62 |
| 1997 | 3.26 | 65 |
| 1996 | 3.3 | 65 |
| 1995 | 3.32 | 63 |
| 1994 | 3.36 | 62 |
| 1993 | 3.41 | 65 |
| 1992 | 3.5 | 69 |
| 1991 | 3.61 | 72 |
| 1990 | 3.73 | 68 |
| 1989 | 3.84 | 70 |
| 1988 | 3.94 | 73 |
| 1987 | 4.02 | 71 |
| 1986 | 4.08 | 69 |