| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 32.98 | 11 |
| 2015 | 33 | 11 |
| 2014 | 33.81 | 11 |
| 2013 | 35.05 | 12 |
| 2012 | 36.49 | 11 |
| 2011 | 38.3 | 8 |
| 2010 | 36.53 | 9 |
| 2009 | 34.03 | 14 |
| 2008 | 32.73 | 15 |
| 2007 | 33.56 | 12 |
| 2006 | 34.64 | 14 |
| 2005 | 36.35 | 14 |
| 2004 | 37.17 | 13 |
| 2003 | 37.54 | 16 |
| 2002 | 38.59 | 15 |
| 2001 | 37.64 | 14 |
| 2000 | 40.82 | 11 |
| 1999 | 41.29 | 11 |
| 1998 | 39.91 | 14 |
| 1997 | 41.43 | 16 |
| 1996 | 41.51 | 14 |
| 1995 | 41.76 | 18 |
| 1994 | 43.07 | 15 |
| 1993 | 42.23 | 18 |
| 1992 | 44.86 | 14 |
| 1991 | 47.21 | 8 |
| 1990 | 51.63 | 8 |
| 1989 | 50.37 | 6 |
| 1988 | 50.9 | 6 |
| 1987 | 50.72 | 6 |
| 1986 | 51.47 | 5 |