| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.11 | 23 |
| 2015 | 4.08 | 31 |
| 2014 | 4.06 | 31 |
| 2013 | 4.04 | 33 |
| 2012 | 4.04 | 32 |
| 2011 | 4.06 | 33 |
| 2010 | 4.08 | 34 |
| 2009 | 4.11 | 31 |
| 2008 | 4.11 | 35 |
| 2007 | 4.1 | 35 |
| 2006 | 4.06 | 33 |
| 2005 | 3.99 | 37 |
| 2004 | 3.93 | 41 |
| 2003 | 3.92 | 42 |
| 2002 | 4 | 42 |
| 2001 | 4.16 | 30 |
| 2000 | 4.4 | 22 |
| 1999 | 4.6 | 19 |
| 1998 | 4.57 | 19 |
| 1997 | 4.19 | 32 |
| 1996 | 3.54 | 58 |
| 1995 | 2.73 | 82 |
| 1994 | 2 | 114 |
| 1993 | 1.57 | 129 |
| 1992 | 1.6 | 125 |
| 1991 | 1.96 | 124 |
| 1990 | 2.52 | 107 |
| 1989 | 3.02 | 93 |
| 1988 | 3.26 | 90 |
| 1987 | 2.91 | 102 |
| 1986 | 2.34 | 124 |