| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.53 | 9 |
| 2015 | 19.28 | 9 |
| 2014 | 19.07 | 9 |
| 2013 | 18.86 | 9 |
| 2012 | 18.66 | 8 |
| 2011 | 18.44 | 8 |
| 2010 | 18.18 | 7 |
| 2009 | 18 | 6 |
| 2008 | 17.78 | 6 |
| 2007 | 17.51 | 8 |
| 2006 | 17.2 | 10 |
| 2005 | 16.86 | 10 |
| 2004 | 16.57 | 11 |
| 2003 | 16.22 | 12 |
| 2002 | 15.83 | 13 |
| 2001 | 15.41 | 15 |
| 2000 | 14.99 | 19 |
| 1999 | 14.75 | 19 |
| 1998 | 14.53 | 19 |
| 1997 | 14.32 | 20 |
| 1996 | 14.06 | 20 |
| 1995 | 13.72 | 20 |
| 1994 | 13.39 | 20 |
| 1993 | 13.02 | 22 |
| 1992 | 12.62 | 24 |
| 1991 | 12.23 | 24 |
| 1990 | 11.88 | 23 |
| 1989 | 11.77 | 22 |
| 1988 | 11.69 | 22 |
| 1987 | 11.64 | 22 |
| 1986 | 11.65 | 21 |