| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.47 | 6 |
| 2015 | 20.08 | 6 |
| 2014 | 19.72 | 5 |
| 2013 | 19.31 | 5 |
| 2012 | 18.87 | 6 |
| 2011 | 18.47 | 7 |
| 2010 | 18.12 | 8 |
| 2009 | 17.9 | 8 |
| 2008 | 17.73 | 8 |
| 2007 | 17.61 | 6 |
| 2006 | 17.49 | 6 |
| 2005 | 17.35 | 5 |
| 2004 | 17.27 | 5 |
| 2003 | 17.17 | 7 |
| 2002 | 17.04 | 7 |
| 2001 | 16.85 | 6 |
| 2000 | 16.59 | 6 |
| 1999 | 16.41 | 6 |
| 1998 | 16.15 | 5 |
| 1997 | 15.84 | 5 |
| 1996 | 15.48 | 7 |
| 1995 | 15.1 | 11 |
| 1994 | 14.74 | 12 |
| 1993 | 14.37 | 14 |
| 1992 | 13.98 | 14 |
| 1991 | 13.58 | 17 |
| 1990 | 13.14 | 18 |
| 1989 | 12.76 | 18 |
| 1988 | 12.35 | 20 |
| 1987 | 11.94 | 21 |
| 1986 | 11.58 | 22 |