| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 22.82 | 27 |
| 2014 | 22.16 | 32 |
| 2013 | 22.89 | 32 |
| 2012 | 23.18 | 31 |
| 2011 | 23.57 | 34 |
| 2010 | 23.39 | 32 |
| 2009 | 23.48 | 36 |
| 2008 | 23.43 | 37 |
| 2007 | 22.9 | 40 |
| 2006 | 21.02 | 44 |
| 2005 | 20.59 | 48 |
| 2004 | 20.42 | 49 |
| 2003 | 21.75 | 45 |
| 2002 | 22.14 | 45 |
| 2001 | 22.17 | 48 |
| 2000 | 22.14 | 49 |
| 1999 | 24.36 | 47 |
| 1998 | 25.33 | 46 |
| 1997 | 24.74 | 42 |
| 1996 | 23.59 | 48 |
| 1995 | 23.63 | 46 |
| 1994 | 23.81 | 50 |
| 1993 | 20.55 | 55 |
| 1992 | 27.27 | 41 |
| 1991 | 24.79 | 46 |
| 1990 | 24.58 | 47 |
| 1989 | 26.11 | 38 |
| 1988 | 24.66 | 41 |
| 1987 | 24.82 | 41 |
| 1986 | 22.36 | 43 |