| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.05 | 101 |
| 2015 | 9.81 | 101 |
| 2014 | 9.62 | 101 |
| 2013 | 9.48 | 100 |
| 2012 | 9.37 | 101 |
| 2011 | 9.28 | 101 |
| 2010 | 9.17 | 102 |
| 2009 | 9.06 | 101 |
| 2008 | 8.95 | 100 |
| 2007 | 8.83 | 98 |
| 2006 | 8.72 | 97 |
| 2005 | 8.63 | 96 |
| 2004 | 8.54 | 95 |
| 2003 | 8.48 | 96 |
| 2002 | 8.43 | 97 |
| 2001 | 8.37 | 98 |
| 2000 | 8.31 | 99 |
| 1999 | 8.23 | 99 |
| 1998 | 8.14 | 100 |
| 1997 | 8.04 | 99 |
| 1996 | 7.94 | 99 |
| 1995 | 7.85 | 100 |
| 1994 | 7.78 | 98 |
| 1993 | 7.71 | 100 |
| 1992 | 7.65 | 97 |
| 1991 | 7.59 | 99 |
| 1990 | 7.53 | 99 |
| 1989 | 7.48 | 95 |
| 1988 | 7.43 | 95 |
| 1987 | 7.4 | 98 |
| 1986 | 7.37 | 97 |