| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 14.85 | 39 |
| 2015 | 14.5 | 40 |
| 2014 | 14.21 | 42 |
| 2013 | 13.91 | 42 |
| 2012 | 13.58 | 42 |
| 2011 | 13.27 | 42 |
| 2010 | 12.97 | 42 |
| 2009 | 12.79 | 42 |
| 2008 | 12.64 | 41 |
| 2007 | 12.49 | 41 |
| 2006 | 12.33 | 42 |
| 2005 | 12.15 | 42 |
| 2004 | 11.99 | 43 |
| 2003 | 11.83 | 43 |
| 2002 | 11.67 | 43 |
| 2001 | 11.5 | 43 |
| 2000 | 11.32 | 43 |
| 1999 | 11.1 | 44 |
| 1998 | 10.91 | 43 |
| 1997 | 10.74 | 43 |
| 1996 | 10.59 | 44 |
| 1995 | 10.47 | 44 |
| 1994 | 10.3 | 44 |
| 1993 | 10.15 | 44 |
| 1992 | 10.02 | 44 |
| 1991 | 9.88 | 44 |
| 1990 | 9.73 | 43 |
| 1989 | 9.49 | 43 |
| 1988 | 9.25 | 43 |
| 1987 | 9.04 | 43 |
| 1986 | 8.85 | 44 |