| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.74 | 2 |
| 2015 | 17.53 | 2 |
| 2014 | 17.28 | 2 |
| 2013 | 16.99 | 1 |
| 2012 | 16.8 | 1 |
| 2011 | 16.72 | 1 |
| 2010 | 16.45 | 2 |
| 2009 | 17.38 | 2 |
| 2008 | 18.81 | 2 |
| 2007 | 21.11 | 2 |
| 2006 | 24.65 | 2 |
| 2005 | 29.79 | 2 |
| 2004 | 30.75 | 2 |
| 2003 | 31.92 | 2 |
| 2002 | 33.4 | 2 |
| 2001 | 35.34 | 2 |
| 2000 | 37.76 | 2 |
| 1999 | 38.04 | 2 |
| 1998 | 38.53 | 2 |
| 1997 | 39.18 | 2 |
| 1996 | 39.81 | 2 |
| 1995 | 40.23 | 4 |
| 1994 | 40.58 | 3 |
| 1993 | 40.8 | 2 |
| 1992 | 40.99 | 2 |
| 1991 | 41.36 | 2 |
| 1990 | 42.02 | 3 |
| 1989 | 42.59 | 3 |
| 1988 | 43.16 | 3 |
| 1987 | 43.67 | 5 |
| 1986 | 43.81 | 4 |