| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.24 | 86 |
| 2015 | 2.28 | 87 |
| 2014 | 2.32 | 82 |
| 2013 | 2.34 | 83 |
| 2012 | 2.37 | 83 |
| 2011 | 2.4 | 81 |
| 2010 | 2.41 | 80 |
| 2009 | 2.42 | 80 |
| 2008 | 2.47 | 82 |
| 2007 | 2.58 | 79 |
| 2006 | 2.75 | 77 |
| 2005 | 2.94 | 72 |
| 2004 | 3.12 | 65 |
| 2003 | 3.29 | 59 |
| 2002 | 3.44 | 57 |
| 2001 | 3.56 | 51 |
| 2000 | 3.8 | 45 |
| 1999 | 3.92 | 37 |
| 1998 | 4.05 | 34 |
| 1997 | 4.19 | 33 |
| 1996 | 4.35 | 29 |
| 1995 | 4.53 | 26 |
| 1994 | 4.68 | 26 |
| 1993 | 4.73 | 29 |
| 1992 | 4.62 | 36 |
| 1991 | 4.4 | 48 |
| 1990 | 8.09 | 2 |
| 1989 | 8.13 | 2 |
| 1988 | 8.23 | 3 |
| 1987 | 8.5 | 3 |
| 1986 | 8.91 | 2 |