| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 14.29 | 46 |
| 2015 | 13.91 | 46 |
| 2014 | 13.56 | 47 |
| 2013 | 13.27 | 47 |
| 2012 | 13.01 | 47 |
| 2011 | 12.76 | 46 |
| 2010 | 12.49 | 46 |
| 2009 | 12.18 | 48 |
| 2008 | 11.88 | 48 |
| 2007 | 11.57 | 50 |
| 2006 | 11.26 | 49 |
| 2005 | 10.95 | 50 |
| 2004 | 10.71 | 50 |
| 2003 | 10.47 | 51 |
| 2002 | 10.23 | 52 |
| 2001 | 10.02 | 52 |
| 2000 | 9.84 | 54 |
| 1999 | 9.68 | 52 |
| 1998 | 9.56 | 52 |
| 1997 | 9.46 | 51 |
| 1996 | 9.35 | 51 |
| 1995 | 9.22 | 50 |
| 1994 | 9.15 | 50 |
| 1993 | 9.07 | 50 |
| 1992 | 8.99 | 49 |
| 1991 | 8.91 | 49 |
| 1990 | 8.85 | 48 |
| 1989 | 8.78 | 47 |
| 1988 | 8.72 | 47 |
| 1987 | 8.65 | 47 |
| 1986 | 8.59 | 47 |