| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 18.23 | 23 |
| 2015 | 18 | 21 |
| 2014 | 17.8 | 20 |
| 2013 | 17.58 | 18 |
| 2012 | 17.34 | 18 |
| 2011 | 17.11 | 17 |
| 2010 | 16.9 | 16 |
| 2009 | 16.63 | 16 |
| 2008 | 16.39 | 17 |
| 2007 | 16.17 | 18 |
| 2006 | 15.98 | 19 |
| 2005 | 15.81 | 19 |
| 2004 | 15.68 | 18 |
| 2003 | 15.58 | 17 |
| 2002 | 15.49 | 16 |
| 2001 | 15.4 | 16 |
| 2000 | 15.3 | 14 |
| 1999 | 15.19 | 15 |
| 1998 | 15.06 | 14 |
| 1997 | 14.93 | 15 |
| 1996 | 14.8 | 15 |
| 1995 | 14.68 | 14 |
| 1994 | 14.68 | 13 |
| 1993 | 14.68 | 10 |
| 1992 | 14.67 | 9 |
| 1991 | 14.64 | 9 |
| 1990 | 14.56 | 10 |
| 1989 | 14.48 | 10 |
| 1988 | 14.35 | 9 |
| 1987 | 14.21 | 8 |
| 1986 | 14.07 | 8 |