| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 32.42 | 35 |
| 2015 | 32.79 | 40 |
| 2014 | 32.07 | 49 |
| 2013 | 32.87 | 48 |
| 2012 | 33.47 | 48 |
| 2011 | 33.83 | 49 |
| 2010 | 34.7 | 46 |
| 2009 | 33.64 | 44 |
| 2008 | 36.12 | 43 |
| 2007 | 36.44 | 42 |
| 2006 | 37.23 | 38 |
| 2005 | 38.08 | 28 |
| 2004 | 36.33 | 35 |
| 2003 | 32.57 | 48 |
| 2002 | 32.77 | 46 |
| 2001 | 35.7 | 35 |
| 2000 | 37.95 | 28 |
| 1999 | 37.23 | 24 |
| 1998 | 37.35 | 19 |
| 1997 | 38.06 | 23 |
| 1996 | 38.71 | 21 |
| 1995 | 36.96 | 28 |
| 1994 | 44.72 | 14 |
| 1993 | 44.57 | 13 |
| 1992 | 43.01 | 19 |
| 1991 | 47.6 | 13 |
| 1990 | 48.35 | 11 |
| 1989 | 50.22 | 8 |