| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.36 | 55 |
| 2015 | 1.31 | 59 |
| 2014 | 1.28 | 61 |
| 2013 | 1.31 | 59 |
| 2012 | 1.44 | 57 |
| 2011 | 1.63 | 52 |
| 2010 | 1.88 | 48 |
| 2009 | 2.12 | 33 |
| 2008 | 2.26 | 29 |
| 2007 | 2.25 | 33 |
| 2006 | 2.12 | 37 |
| 2005 | 1.92 | 47 |
| 2004 | 1.74 | 52 |
| 2003 | 1.62 | 54 |
| 2002 | 1.58 | 61 |
| 2001 | 1.63 | 53 |
| 2000 | 1.69 | 49 |
| 1999 | 1.74 | 53 |
| 1998 | 1.76 | 52 |
| 1997 | 1.76 | 56 |
| 1996 | 1.85 | 53 |
| 1995 | 1.83 | 54 |
| 1994 | 1.81 | 56 |
| 1993 | 1.8 | 56 |
| 1992 | 1.79 | 59 |
| 1991 | 1.8 | 60 |
| 1990 | 1.81 | 57 |
| 1989 | 1.81 | 63 |
| 1988 | 1.83 | 60 |
| 1987 | 1.86 | 62 |
| 1986 | 1.91 | 59 |