| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 37.26 | 15 |
| 2015 | 39.95 | 26 |
| 2014 | 39.04 | 25 |
| 2013 | 38.99 | 33 |
| 2012 | 37.96 | 31 |
| 2011 | 36.38 | 34 |
| 2010 | 35.26 | 39 |
| 2009 | 33.8 | 39 |
| 2008 | 38.31 | 34 |
| 2007 | 36.23 | 39 |
| 2006 | 34.48 | 39 |
| 2005 | 30.39 | 40 |
| 2004 | 27.73 | 46 |
| 2003 | 27.48 | 43 |
| 2002 | 28.53 | 40 |
| 2001 | 28.68 | 35 |
| 2000 | 27.28 | 37 |
| 1999 | 21.57 | 52 |
| 1998 | 17.51 | 64 |
| 1997 | 16 | 70 |
| 1996 | 16.67 | 69 |
| 1995 | 15.86 | 71 |
| 1994 | 16.48 | 68 |
| 1993 | 16.08 | 64 |
| 1992 | 16.23 | 60 |
| 1991 | 17.73 | 46 |
| 1990 | 16.67 | 54 |
| 1989 | 16.2 | 55 |
| 1988 | 15.62 | 55 |
| 1987 | 13.85 | 57 |
| 1986 | 14.12 | 55 |