| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.6 | 59 |
| 2015 | 1.25 | 90 |
| 2014 | 1.25 | 92 |
| 2013 | 1.33 | 88 |
| 2012 | 1.34 | 84 |
| 2011 | 1.31 | 82 |
| 2010 | 1.5 | 76 |
| 2009 | 1.47 | 81 |
| 2008 | 1.49 | 82 |
| 2007 | 1.45 | 85 |
| 2006 | 1.43 | 90 |
| 2005 | 1.34 | 105 |
| 2004 | 1.4 | 96 |
| 2003 | 1.38 | 103 |
| 2002 | 1.34 | 100 |
| 2001 | 1.29 | 104 |
| 2000 | 1.32 | 100 |
| 1999 | 1.44 | 87 |
| 1998 | 1.4 | 95 |
| 1997 | 1.3 | 104 |
| 1996 | 1.22 | 108 |
| 1995 | 1.25 | 105 |
| 1994 | 1.31 | 108 |
| 1993 | 1.33 | 111 |
| 1992 | 1.52 | 97 |
| 1991 | 1.51 | 92 |
| 1990 | 1.47 | 92 |
| 1989 | 1.33 | 94 |
| 1988 | 1.26 | 97 |
| 1987 | 1.25 | 97 |
| 1986 | 1.23 | 90 |