| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 41.9 | 28 |
| 2015 | 42.1 | 28 |
| 2014 | 42.4 | 27 |
| 2013 | 42.7 | 28 |
| 2012 | 43 | 28 |
| 2011 | 43.2 | 28 |
| 2010 | 43.3 | 27 |
| 2009 | 43.6 | 24 |
| 2008 | 43.9 | 24 |
| 2007 | 44 | 25 |
| 2006 | 44.2 | 23 |
| 2005 | 44.3 | 23 |
| 2004 | 44.5 | 23 |
| 2003 | 44.7 | 22 |
| 2002 | 44.8 | 22 |
| 2001 | 44.9 | 25 |
| 2000 | 44.8 | 26 |
| 1999 | 44.9 | 29 |
| 1998 | 44.8 | 29 |
| 1997 | 44.7 | 32 |
| 1996 | 44.6 | 35 |
| 1995 | 44.5 | 37 |
| 1994 | 44.3 | 47 |
| 1993 | 44.3 | 46 |
| 1992 | 44.4 | 50 |
| 1991 | 44.4 | 51 |
| 1990 | 44.3 | 52 |
| 1989 | 44.4 | 49 |
| 1988 | 44.4 | 51 |
| 1987 | 44.3 | 56 |
| 1986 | 44.2 | 58 |