| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.25 | 16 |
| 2015 | 2.34 | 18 |
| 2014 | 2.42 | 18 |
| 2013 | 2.47 | 17 |
| 2012 | 2.49 | 18 |
| 2011 | 2.47 | 22 |
| 2010 | 2.43 | 22 |
| 2009 | 2.4 | 19 |
| 2008 | 2.36 | 22 |
| 2007 | 2.35 | 26 |
| 2006 | 2.35 | 25 |
| 2005 | 2.36 | 25 |
| 2004 | 2.36 | 30 |
| 2003 | 2.36 | 30 |
| 2002 | 2.31 | 32 |
| 2001 | 2.26 | 31 |
| 2000 | 2.2 | 34 |
| 1999 | 2.15 | 37 |
| 1998 | 2.14 | 40 |
| 1997 | 2.21 | 42 |
| 1996 | 2.33 | 35 |
| 1995 | 2.48 | 33 |
| 1994 | 2.62 | 28 |
| 1993 | 2.74 | 29 |
| 1992 | 2.8 | 26 |
| 1991 | 2.81 | 25 |
| 1990 | 2.82 | 22 |
| 1989 | 2.82 | 23 |
| 1988 | 2.5 | 34 |
| 1987 | 2.47 | 42 |
| 1986 | 2.48 | 38 |