| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.35 | 39 |
| 2015 | 17.46 | 45 |
| 2014 | 18.02 | 46 |
| 2013 | 18.59 | 48 |
| 2012 | 18.2 | 48 |
| 2011 | 18.53 | 46 |
| 2010 | 18.88 | 46 |
| 2009 | 18.39 | 47 |
| 2008 | 18.44 | 48 |
| 2007 | 18.93 | 51 |
| 2006 | 18.97 | 52 |
| 2005 | 19.51 | 52 |
| 2004 | 19.73 | 52 |
| 2003 | 21.51 | 47 |
| 2002 | 21.46 | 49 |
| 2001 | 23.77 | 42 |
| 2000 | 23.88 | 42 |
| 1999 | 25.41 | 44 |
| 1998 | 26.75 | 42 |
| 1997 | 26.85 | 39 |
| 1996 | 28.13 | 37 |
| 1995 | 27.23 | 40 |
| 1994 | 29.32 | 38 |
| 1993 | 29.74 | 37 |
| 1992 | 29.8 | 34 |
| 1991 | 30.48 | 34 |
| 1990 | 30.1 | 32 |
| 1989 | 30.05 | 32 |
| 1988 | 31.32 | 30 |
| 1987 | 30.26 | 28 |
| 1986 | 30.84 | 29 |