| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.42 | 27 |
| 2015 | 17 | 27 |
| 2014 | 16.66 | 26 |
| 2013 | 16.35 | 26 |
| 2012 | 16.08 | 26 |
| 2011 | 15.86 | 26 |
| 2010 | 15.69 | 24 |
| 2009 | 15.58 | 24 |
| 2008 | 15.54 | 23 |
| 2007 | 15.51 | 23 |
| 2006 | 15.42 | 22 |
| 2005 | 15.22 | 22 |
| 2004 | 15.04 | 22 |
| 2003 | 14.75 | 24 |
| 2002 | 14.37 | 25 |
| 2001 | 13.98 | 26 |
| 2000 | 13.61 | 27 |
| 1999 | 13.32 | 28 |
| 1998 | 13.04 | 29 |
| 1997 | 12.76 | 30 |
| 1996 | 12.44 | 31 |
| 1995 | 12.05 | 32 |
| 1994 | 11.75 | 33 |
| 1993 | 11.41 | 34 |
| 1992 | 11.05 | 35 |
| 1991 | 10.71 | 37 |
| 1990 | 10.41 | 37 |
| 1989 | 10.16 | 37 |
| 1988 | 9.93 | 38 |
| 1987 | 9.73 | 40 |
| 1986 | 9.57 | 40 |