| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 16.867 | 15 |
| 2015 | 16.849 | 22 |
| 2014 | 16.548 | 22 |
| 2013 | 16.723 | 23 |
| 2012 | 16.793 | 26 |
| 2011 | 16.017 | 28 |
| 2010 | 17.585 | 22 |
| 2009 | 18.362 | 24 |
| 2008 | 15.48 | 41 |
| 2007 | 16.939 | 32 |
| 2006 | 16.9 | 32 |
| 2005 | 17.948 | 28 |
| 2004 | 19.181 | 28 |
| 2003 | 20.714 | 26 |
| 2002 | 24.771 | 21 |
| 2001 | 23.438 | 27 |
| 2000 | 21.274 | 43 |
| 1999 | 20.29 | 51 |
| 1998 | 18.184 | 62 |
| 1997 | 17.795 | 62 |
| 1996 | 19.837 | 59 |
| 1995 | 20.233 | 45 |
| 1994 | 20.483 | 39 |
| 1993 | 31.65 | 23 |
| 1992 | 24.758 | 26 |
| 1991 | 20.042 | 32 |
| 1990 | 25.3 | 20 |
| 1989 | 20.442 | 22 |
| 1988 | 16.617 | 26 |
| 1987 | 13.962 | 40 |
| 1986 | 9.959 | 75 |