| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 21.27 | 3 |
| 2015 | 21.12 | 3 |
| 2014 | 20.98 | 3 |
| 2013 | 20.88 | 3 |
| 2012 | 20.79 | 3 |
| 2011 | 20.68 | 3 |
| 2010 | 20.54 | 2 |
| 2009 | 20.29 | 2 |
| 2008 | 20.01 | 3 |
| 2007 | 19.69 | 3 |
| 2006 | 19.31 | 3 |
| 2005 | 18.86 | 3 |
| 2004 | 18.42 | 3 |
| 2003 | 17.92 | 3 |
| 2002 | 17.38 | 3 |
| 2001 | 16.88 | 5 |
| 2000 | 16.47 | 7 |
| 1999 | 16.17 | 7 |
| 1998 | 15.96 | 6 |
| 1997 | 15.82 | 6 |
| 1996 | 15.66 | 6 |
| 1995 | 15.46 | 6 |
| 1994 | 15.39 | 6 |
| 1993 | 15.29 | 7 |
| 1992 | 15.18 | 7 |
| 1991 | 15.04 | 8 |
| 1990 | 14.9 | 7 |
| 1989 | 14.8 | 5 |
| 1988 | 14.69 | 6 |
| 1987 | 14.58 | 6 |
| 1986 | 14.53 | 6 |