| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 42.5 | 24 |
| 2015 | 42.7 | 25 |
| 2014 | 42.9 | 25 |
| 2013 | 43 | 25 |
| 2012 | 43.2 | 24 |
| 2011 | 43.4 | 24 |
| 2010 | 43.5 | 24 |
| 2009 | 43.6 | 25 |
| 2008 | 43.8 | 25 |
| 2007 | 43.9 | 26 |
| 2006 | 44 | 26 |
| 2005 | 44 | 26 |
| 2004 | 44.1 | 26 |
| 2003 | 44.2 | 28 |
| 2002 | 44.3 | 29 |
| 2001 | 44.3 | 29 |
| 2000 | 44.2 | 32 |
| 1999 | 44.4 | 31 |
| 1998 | 44.4 | 32 |
| 1997 | 44.4 | 37 |
| 1996 | 44.3 | 39 |
| 1995 | 44.2 | 44 |
| 1994 | 44.3 | 46 |
| 1993 | 44.3 | 50 |
| 1992 | 44.2 | 53 |
| 1991 | 44 | 56 |
| 1990 | 43.8 | 60 |
| 1989 | 43.7 | 63 |
| 1988 | 43.5 | 62 |
| 1987 | 43.4 | 63 |
| 1986 | 43.2 | 64 |