| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.76 | 27 |
| 2015 | 22.81 | 28 |
| 2014 | 22.8 | 30 |
| 2013 | 22.87 | 31 |
| 2012 | 22.97 | 30 |
| 2011 | 23.04 | 31 |
| 2010 | 23.02 | 30 |
| 2009 | 22.93 | 29 |
| 2008 | 22.76 | 23 |
| 2007 | 22.63 | 21 |
| 2006 | 22.71 | 18 |
| 2005 | 23.11 | 19 |
| 2004 | 23.74 | 17 |
| 2003 | 24.7 | 20 |
| 2002 | 25.81 | 21 |
| 2001 | 26.74 | 23 |
| 2000 | 27.31 | 24 |
| 1999 | 28.15 | 24 |
| 1998 | 28.67 | 23 |
| 1997 | 29.06 | 23 |
| 1996 | 29.74 | 24 |
| 1995 | 30.98 | 27 |
| 1994 | 31.95 | 28 |
| 1993 | 33.24 | 33 |
| 1992 | 34.64 | 40 |
| 1991 | 35.68 | 42 |
| 1990 | 36.07 | 40 |
| 1989 | 36.84 | 40 |
| 1988 | 37.17 | 41 |
| 1987 | 37.3 | 40 |
| 1986 | 37.67 | 41 |