| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.48 | 78 |
| 2015 | 2.57 | 74 |
| 2014 | 2.65 | 71 |
| 2013 | 2.73 | 68 |
| 2012 | 2.8 | 69 |
| 2011 | 2.87 | 70 |
| 2010 | 2.94 | 72 |
| 2009 | 2.97 | 70 |
| 2008 | 3.02 | 68 |
| 2007 | 3.05 | 69 |
| 2006 | 3.09 | 70 |
| 2005 | 3.12 | 68 |
| 2004 | 3.15 | 64 |
| 2003 | 3.18 | 64 |
| 2002 | 3.21 | 64 |
| 2001 | 3.23 | 61 |
| 2000 | 4.32 | 25 |
| 1999 | 4.38 | 23 |
| 1998 | 4.46 | 24 |
| 1997 | 4.54 | 25 |
| 1996 | 4.65 | 21 |
| 1995 | 4.76 | 18 |
| 1994 | 4.87 | 20 |
| 1993 | 4.97 | 24 |
| 1992 | 5.08 | 26 |
| 1991 | 5.05 | 29 |
| 1990 | 4.88 | 37 |
| 1989 | 4.96 | 34 |
| 1988 | 5.07 | 39 |
| 1987 | 5.18 | 39 |
| 1986 | 5.29 | 39 |