| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 36.91 | 16 |
| 2015 | 36.98 | 22 |
| 2014 | 37.55 | 27 |
| 2013 | 37.67 | 29 |
| 2012 | 41.74 | 20 |
| 2011 | 44.84 | 19 |
| 2010 | 44.8 | 18 |
| 2009 | 40.31 | 20 |
| 2008 | 42.36 | 25 |
| 2007 | 39.52 | 32 |
| 2006 | 39.9 | 32 |
| 2005 | 34.76 | 41 |
| 2004 | 32.78 | 53 |
| 2003 | 34.09 | 44 |
| 2002 | 33.91 | 43 |
| 2001 | 33.99 | 44 |
| 2000 | 33.47 | 49 |
| 1999 | 30.16 | 61 |
| 1998 | 32.24 | 46 |
| 1997 | 30.11 | 70 |
| 1996 | 30.76 | 63 |
| 1995 | 29.2 | 80 |
| 1994 | 26 | 84 |
| 1993 | 29.4 | 70 |
| 1992 | 27.72 | 73 |
| 1991 | 31.56 | 57 |
| 1990 | 33.33 | 46 |
| 1989 | 33.9 | 42 |
| 1988 | 33.69 | 40 |
| 1987 | 32.34 | 48 |
| 1986 | 34.58 | 31 |