| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.05 | 55 |
| 2015 | 3.11 | 57 |
| 2014 | 3.18 | 54 |
| 2013 | 3.25 | 54 |
| 2012 | 3.32 | 51 |
| 2011 | 3.39 | 53 |
| 2010 | 3.47 | 54 |
| 2009 | 3.54 | 49 |
| 2008 | 3.61 | 49 |
| 2007 | 3.7 | 48 |
| 2006 | 3.78 | 47 |
| 2005 | 3.88 | 40 |
| 2004 | 3.97 | 38 |
| 2003 | 4.03 | 37 |
| 2002 | 4.01 | 41 |
| 2001 | 3.92 | 42 |
| 2000 | 3.79 | 46 |
| 1999 | 3.68 | 49 |
| 1998 | 3.63 | 52 |
| 1997 | 3.67 | 54 |
| 1996 | 3.81 | 52 |
| 1995 | 3.97 | 45 |
| 1994 | 4.12 | 45 |
| 1993 | 4.22 | 45 |
| 1992 | 4.29 | 45 |
| 1991 | 4.68 | 38 |
| 1990 | 4.65 | 43 |
| 1989 | 4.64 | 44 |
| 1988 | 4.64 | 46 |
| 1987 | 4.62 | 53 |
| 1986 | 4.61 | 57 |