| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.98 | 28 |
| 2015 | 22.63 | 27 |
| 2014 | 22.08 | 24 |
| 2013 | 21.55 | 19 |
| 2012 | 21.06 | 11 |
| 2011 | 20.63 | 8 |
| 2010 | 20.25 | 7 |
| 2009 | 20.12 | 7 |
| 2008 | 20.15 | 7 |
| 2007 | 20.32 | 8 |
| 2006 | 20.53 | 6 |
| 2005 | 20.68 | 4 |
| 2004 | 21.12 | 6 |
| 2003 | 21.56 | 7 |
| 2002 | 22.05 | 7 |
| 2001 | 22.67 | 8 |
| 2000 | 23.54 | 9 |
| 1999 | 24.2 | 10 |
| 1998 | 24.89 | 10 |
| 1997 | 25.62 | 11 |
| 1996 | 26.45 | 15 |
| 1995 | 27.37 | 19 |
| 1994 | 28.39 | 19 |
| 1993 | 29.62 | 21 |
| 1992 | 30.94 | 26 |
| 1991 | 32.06 | 27 |
| 1990 | 32.77 | 28 |
| 1989 | 33.79 | 31 |
| 1988 | 34.48 | 33 |
| 1987 | 34.94 | 34 |
| 1986 | 35.47 | 33 |