| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.18 | 29 |
| 2015 | 20.15 | 36 |
| 2014 | 20.11 | 39 |
| 2013 | 20.24 | 42 |
| 2012 | 20.54 | 39 |
| 2011 | 22.06 | 39 |
| 2010 | 22.04 | 37 |
| 2009 | 25.86 | 29 |
| 2008 | 24.95 | 30 |
| 2007 | 25.35 | 32 |
| 2006 | 23.84 | 36 |
| 2005 | 24.16 | 37 |
| 2004 | 25.05 | 34 |
| 2003 | 22.33 | 44 |
| 2002 | 23.42 | 43 |
| 2001 | 23.23 | 43 |
| 2000 | 22.38 | 48 |
| 1999 | 22.47 | 49 |
| 1998 | 22.11 | 49 |
| 1997 | 21.04 | 53 |
| 1996 | 18.02 | 64 |
| 1995 | 19.24 | 60 |
| 1994 | 20.87 | 57 |
| 1993 | 17.99 | 62 |
| 1992 | 17.07 | 63 |
| 1991 | 18.85 | 60 |
| 1990 | 23.78 | 48 |
| 1989 | 24.07 | 42 |
| 1988 | 23.46 | 44 |
| 1987 | 24.65 | 42 |
| 1986 | 23.93 | 42 |