| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.21 | 47 |
| 2015 | 3.17 | 54 |
| 2014 | 3.15 | 55 |
| 2013 | 3.19 | 57 |
| 2012 | 3.32 | 52 |
| 2011 | 3.52 | 50 |
| 2010 | 3.78 | 41 |
| 2009 | 4.02 | 33 |
| 2008 | 4.16 | 32 |
| 2007 | 4.16 | 32 |
| 2006 | 4.02 | 36 |
| 2005 | 3.83 | 43 |
| 2004 | 3.65 | 49 |
| 2003 | 3.53 | 53 |
| 2002 | 3.49 | 53 |
| 2001 | 3.54 | 56 |
| 2000 | 3.6 | 52 |
| 1999 | 3.64 | 53 |
| 1998 | 3.67 | 50 |
| 1997 | 3.67 | 55 |
| 1996 | 3.56 | 56 |
| 1995 | 3.52 | 56 |
| 1994 | 3.5 | 58 |
| 1993 | 3.49 | 63 |
| 1992 | 3.49 | 70 |
| 1991 | 3.49 | 74 |
| 1990 | 3.49 | 78 |
| 1989 | 3.5 | 79 |
| 1988 | 3.52 | 86 |
| 1987 | 3.55 | 90 |
| 1986 | 3.6 | 87 |