| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 28.17 | 3 |
| 2015 | 26.62 | 3 |
| 2014 | 25.58 | 3 |
| 2013 | 24.85 | 3 |
| 2012 | 24.43 | 3 |
| 2011 | 24.27 | 3 |
| 2010 | 24.3 | 3 |
| 2009 | 25.1 | 3 |
| 2008 | 26.24 | 3 |
| 2007 | 27.71 | 3 |
| 2006 | 29.52 | 3 |
| 2005 | 31.65 | 3 |
| 2004 | 33.82 | 3 |
| 2003 | 36.26 | 3 |
| 2002 | 38.82 | 5 |
| 2001 | 41.26 | 6 |
| 2000 | 43.36 | 9 |
| 1999 | 44.85 | 11 |
| 1998 | 46.06 | 14 |
| 1997 | 47.05 | 20 |
| 1996 | 47.85 | 24 |
| 1995 | 48.46 | 27 |
| 1994 | 48.86 | 26 |
| 1993 | 48.75 | 24 |
| 1992 | 48.22 | 21 |
| 1991 | 47.63 | 21 |
| 1990 | 47.19 | 19 |
| 1989 | 46.65 | 16 |
| 1988 | 46.48 | 13 |
| 1987 | 46.56 | 14 |
| 1986 | 46.23 | 12 |