| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.04 | 99 |
| 2015 | 1.09 | 107 |
| 2014 | 1.14 | 98 |
| 2013 | 1.13 | 103 |
| 2012 | 1.15 | 101 |
| 2011 | 1.12 | 100 |
| 2010 | 1.21 | 100 |
| 2009 | 1.18 | 107 |
| 2008 | 1.17 | 110 |
| 2007 | 1.31 | 96 |
| 2006 | 1.33 | 98 |
| 2005 | 1.42 | 94 |
| 2004 | 1.44 | 89 |
| 2003 | 1.6 | 83 |
| 2002 | 1.65 | 79 |
| 2001 | 1.72 | 75 |
| 2000 | 1.84 | 66 |
| 1999 | 1.9 | 63 |
| 1998 | 1.92 | 62 |
| 1997 | 1.97 | 67 |
| 1996 | 2.15 | 57 |
| 1995 | 2.17 | 63 |
| 1994 | 2.28 | 60 |
| 1993 | 2.39 | 60 |
| 1992 | 2.29 | 63 |
| 1991 | 2.3 | 64 |
| 1990 | 2.39 | 61 |
| 1989 | 2.34 | 64 |
| 1988 | 2.41 | 60 |
| 1987 | 2.48 | 61 |
| 1986 | 2.41 | 60 |