| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.03 | 15 |
| 2015 | 18.84 | 14 |
| 2014 | 18.66 | 10 |
| 2013 | 18.47 | 10 |
| 2012 | 18.27 | 10 |
| 2011 | 18.05 | 9 |
| 2010 | 17.8 | 9 |
| 2009 | 17.51 | 9 |
| 2008 | 17.17 | 12 |
| 2007 | 16.82 | 13 |
| 2006 | 16.49 | 14 |
| 2005 | 16.2 | 14 |
| 2004 | 15.97 | 15 |
| 2003 | 15.79 | 15 |
| 2002 | 15.65 | 15 |
| 2001 | 15.52 | 13 |
| 2000 | 15.39 | 13 |
| 1999 | 15.34 | 13 |
| 1998 | 15.3 | 13 |
| 1997 | 15.28 | 13 |
| 1996 | 15.25 | 11 |
| 1995 | 15.19 | 8 |
| 1994 | 15.21 | 8 |
| 1993 | 15.21 | 8 |
| 1992 | 15.17 | 8 |
| 1991 | 15.08 | 7 |
| 1990 | 14.92 | 6 |
| 1989 | 14.79 | 6 |
| 1988 | 14.58 | 7 |
| 1987 | 14.35 | 7 |
| 1986 | 14.19 | 7 |