| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.01 | 25 |
| 2015 | 2.08 | 25 |
| 2014 | 2.14 | 22 |
| 2013 | 2.19 | 23 |
| 2012 | 2.22 | 22 |
| 2011 | 2.23 | 28 |
| 2010 | 2.21 | 31 |
| 2009 | 2.18 | 28 |
| 2008 | 2.15 | 32 |
| 2007 | 2.12 | 39 |
| 2006 | 2.09 | 39 |
| 2005 | 2.06 | 38 |
| 2004 | 2.02 | 42 |
| 2003 | 2.02 | 44 |
| 2002 | 1.93 | 45 |
| 2001 | 1.81 | 49 |
| 2000 | 2.02 | 39 |
| 1999 | 2.25 | 34 |
| 1998 | 2.19 | 37 |
| 1997 | 2.18 | 44 |
| 1996 | 2.22 | 40 |
| 1995 | 2.25 | 40 |
| 1994 | 2.3 | 40 |
| 1993 | 2.44 | 37 |
| 1992 | 2.69 | 29 |
| 1991 | 3.02 | 18 |
| 1990 | 3.41 | 9 |
| 1989 | 3.49 | 9 |
| 1988 | 3.5 | 10 |
| 1987 | 3.6 | 11 |
| 1986 | 3.55 | 8 |