| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 66.3 | 71 |
| 2015 | 66.7 | 69 |
| 2014 | 67 | 66 |
| 2013 | 67.3 | 62 |
| 2012 | 67.5 | 61 |
| 2011 | 67.6 | 60 |
| 2010 | 67.7 | 60 |
| 2009 | 67.5 | 62 |
| 2008 | 67.2 | 64 |
| 2007 | 66.8 | 68 |
| 2006 | 66.5 | 71 |
| 2005 | 66.2 | 71 |
| 2004 | 65.8 | 73 |
| 2003 | 65.5 | 72 |
| 2002 | 65.3 | 68 |
| 2001 | 65.2 | 68 |
| 2000 | 65 | 68 |
| 1999 | 64.7 | 69 |
| 1998 | 64.5 | 70 |
| 1997 | 64.3 | 69 |
| 1996 | 64.1 | 68 |
| 1995 | 64.1 | 68 |
| 1994 | 64.3 | 61 |
| 1993 | 64.7 | 59 |
| 1992 | 65.1 | 55 |
| 1991 | 65.5 | 52 |
| 1990 | 65.8 | 45 |
| 1989 | 66 | 38 |
| 1988 | 66.1 | 37 |
| 1987 | 66.2 | 37 |
| 1986 | 66.2 | 33 |