| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 45.1 | 39 |
| 2015 | 43.52 | 29 |
| 2014 | 42.35 | 25 |
| 2013 | 41.19 | 20 |
| 2012 | 40.11 | 18 |
| 2011 | 39.29 | 14 |
| 2010 | 38.85 | 12 |
| 2009 | 38.78 | 12 |
| 2008 | 39.07 | 12 |
| 2007 | 39.66 | 12 |
| 2006 | 40.31 | 12 |
| 2005 | 40.83 | 13 |
| 2004 | 41.66 | 14 |
| 2003 | 42.4 | 14 |
| 2002 | 43.05 | 12 |
| 2001 | 43.66 | 11 |
| 2000 | 44.27 | 11 |
| 1999 | 45.56 | 12 |
| 1998 | 46.87 | 19 |
| 1997 | 48.12 | 27 |
| 1996 | 49.31 | 35 |
| 1995 | 50.42 | 41 |
| 1994 | 50.84 | 41 |
| 1993 | 50.94 | 41 |
| 1992 | 50.75 | 37 |
| 1991 | 50.33 | 33 |
| 1990 | 49.72 | 26 |
| 1989 | 49.4 | 25 |
| 1988 | 49.1 | 23 |
| 1987 | 48.79 | 20 |
| 1986 | 48.4 | 20 |