| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.35 | 11 |
| 2015 | 18.94 | 11 |
| 2014 | 18.49 | 15 |
| 2013 | 18 | 16 |
| 2012 | 17.52 | 16 |
| 2011 | 17.12 | 16 |
| 2010 | 16.82 | 17 |
| 2009 | 16.61 | 17 |
| 2008 | 16.52 | 16 |
| 2007 | 16.5 | 15 |
| 2006 | 16.5 | 13 |
| 2005 | 16.46 | 13 |
| 2004 | 16.42 | 13 |
| 2003 | 16.35 | 11 |
| 2002 | 16.25 | 11 |
| 2001 | 16.14 | 10 |
| 2000 | 16.01 | 10 |
| 1999 | 15.87 | 11 |
| 1998 | 15.7 | 11 |
| 1997 | 15.52 | 10 |
| 1996 | 15.32 | 9 |
| 1995 | 15.11 | 10 |
| 1994 | 14.91 | 9 |
| 1993 | 14.73 | 9 |
| 1992 | 14.54 | 11 |
| 1991 | 14.31 | 11 |
| 1990 | 14.02 | 11 |
| 1989 | 13.75 | 11 |
| 1988 | 13.41 | 11 |
| 1987 | 13.05 | 12 |
| 1986 | 12.79 | 13 |