| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 54.52 | 104 |
| 2015 | 53.76 | 103 |
| 2014 | 52.42 | 93 |
| 2013 | 51.04 | 82 |
| 2012 | 49.64 | 71 |
| 2011 | 48.23 | 63 |
| 2010 | 46.83 | 52 |
| 2009 | 46.18 | 44 |
| 2008 | 45.56 | 40 |
| 2007 | 45.05 | 32 |
| 2006 | 44.7 | 27 |
| 2005 | 44.51 | 25 |
| 2004 | 44.58 | 22 |
| 2003 | 44.87 | 21 |
| 2002 | 45.39 | 21 |
| 2001 | 46.09 | 23 |
| 2000 | 46.97 | 27 |
| 1999 | 47.96 | 34 |
| 1998 | 49.2 | 39 |
| 1997 | 50.67 | 48 |
| 1996 | 52.3 | 52 |
| 1995 | 54.08 | 57 |
| 1994 | 55.71 | 62 |
| 1993 | 57.38 | 68 |
| 1992 | 59.08 | 70 |
| 1991 | 60.88 | 73 |
| 1990 | 62.82 | 76 |
| 1989 | 64.23 | 77 |
| 1988 | 65.63 | 77 |
| 1987 | 66.87 | 80 |
| 1986 | 67.79 | 80 |