| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.86 | 34 |
| 2015 | 23.84 | 34 |
| 2014 | 23.99 | 35 |
| 2013 | 24.15 | 36 |
| 2012 | 24.37 | 36 |
| 2011 | 24.77 | 36 |
| 2010 | 25.4 | 40 |
| 2009 | 26.03 | 41 |
| 2008 | 26.84 | 44 |
| 2007 | 27.74 | 44 |
| 2006 | 28.62 | 47 |
| 2005 | 29.37 | 47 |
| 2004 | 30.26 | 49 |
| 2003 | 31.07 | 50 |
| 2002 | 31.84 | 50 |
| 2001 | 32.67 | 49 |
| 2000 | 33.63 | 49 |
| 1999 | 34.54 | 49 |
| 1998 | 35.49 | 50 |
| 1997 | 36.44 | 50 |
| 1996 | 37.28 | 50 |
| 1995 | 37.94 | 50 |
| 1994 | 38.35 | 50 |
| 1993 | 38.64 | 51 |
| 1992 | 38.85 | 52 |
| 1991 | 39.05 | 51 |
| 1990 | 39.32 | 49 |
| 1989 | 39.68 | 49 |
| 1988 | 40.08 | 49 |
| 1987 | 40.54 | 48 |
| 1986 | 41.04 | 47 |