| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.18 | 89 |
| 2015 | 1.18 | 94 |
| 2014 | 1.19 | 94 |
| 2013 | 1.22 | 97 |
| 2012 | 1.31 | 87 |
| 2011 | 1.28 | 87 |
| 2010 | 1.35 | 88 |
| 2009 | 1.39 | 90 |
| 2008 | 1.28 | 100 |
| 2007 | 1.24 | 104 |
| 2006 | 1.27 | 105 |
| 2005 | 1.33 | 108 |
| 2004 | 1.35 | 105 |
| 2003 | 1.4 | 101 |
| 2002 | 1.41 | 94 |
| 2001 | 1.41 | 96 |
| 2000 | 1.44 | 89 |
| 1999 | 1.48 | 85 |
| 1998 | 1.48 | 87 |
| 1997 | 1.5 | 91 |
| 1996 | 1.56 | 83 |
| 1995 | 1.59 | 88 |
| 1994 | 1.65 | 92 |
| 1993 | 1.8 | 92 |
| 1992 | 1.98 | 78 |
| 1991 | 2.12 | 74 |
| 1990 | 2.4 | 60 |
| 1989 | 2.41 | 60 |
| 1988 | 2.51 | 53 |
| 1987 | 2.64 | 56 |
| 1986 | 2.66 | 51 |