| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.47 | 66 |
| 2015 | 1.45 | 76 |
| 2014 | 1.35 | 83 |
| 2013 | 1.28 | 91 |
| 2012 | 1.22 | 93 |
| 2011 | 1.28 | 86 |
| 2010 | 1.24 | 97 |
| 2009 | 1.33 | 97 |
| 2008 | 1.44 | 89 |
| 2007 | 1.52 | 78 |
| 2006 | 1.82 | 64 |
| 2005 | 1.98 | 60 |
| 2004 | 2.01 | 58 |
| 2003 | 2.09 | 61 |
| 2002 | 2.29 | 53 |
| 2001 | 2.42 | 49 |
| 2000 | 2.5 | 45 |
| 1999 | 2.64 | 45 |
| 1998 | 2.99 | 36 |
| 1997 | 3 | 38 |
| 1996 | 2.35 | 50 |
| 1995 | 2.61 | 47 |
| 1994 | 3.11 | 35 |
| 1993 | 2.74 | 47 |
| 1992 | 4.25 | 26 |
| 1991 | 4.77 | 22 |
| 1990 | 4.55 | 25 |
| 1989 | 4.8 | 22 |
| 1988 | 4.21 | 29 |
| 1987 | 3.91 | 34 |
| 1986 | 4.45 | 24 |