| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.43 | 10 |
| 2015 | 19.05 | 10 |
| 2014 | 18.57 | 12 |
| 2013 | 18.03 | 15 |
| 2012 | 17.49 | 17 |
| 2011 | 17.03 | 18 |
| 2010 | 16.67 | 19 |
| 2009 | 16.3 | 20 |
| 2008 | 15.96 | 20 |
| 2007 | 15.66 | 22 |
| 2006 | 15.39 | 23 |
| 2005 | 15.15 | 23 |
| 2004 | 15.02 | 23 |
| 2003 | 14.94 | 22 |
| 2002 | 14.9 | 20 |
| 2001 | 14.88 | 20 |
| 2000 | 14.85 | 20 |
| 1999 | 14.94 | 17 |
| 1998 | 15.02 | 15 |
| 1997 | 15.1 | 14 |
| 1996 | 15.18 | 12 |
| 1995 | 15.24 | 7 |
| 1994 | 15.36 | 7 |
| 1993 | 15.46 | 6 |
| 1992 | 15.54 | 5 |
| 1991 | 15.59 | 4 |
| 1990 | 15.6 | 4 |
| 1989 | 15.57 | 4 |
| 1988 | 15.5 | 4 |
| 1987 | 15.39 | 4 |
| 1986 | 15.26 | 4 |