| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 65.3 | 95 |
| 2015 | 65.6 | 88 |
| 2014 | 66 | 82 |
| 2013 | 66.4 | 78 |
| 2012 | 66.8 | 75 |
| 2011 | 67 | 73 |
| 2010 | 67 | 73 |
| 2009 | 67.1 | 69 |
| 2008 | 67.1 | 67 |
| 2007 | 67 | 63 |
| 2006 | 66.9 | 64 |
| 2005 | 66.8 | 60 |
| 2004 | 66.5 | 62 |
| 2003 | 66.2 | 62 |
| 2002 | 65.9 | 61 |
| 2001 | 65.5 | 63 |
| 2000 | 64.8 | 69 |
| 1999 | 64.8 | 68 |
| 1998 | 64.7 | 67 |
| 1997 | 64.7 | 63 |
| 1996 | 64.6 | 59 |
| 1995 | 64.6 | 59 |
| 1994 | 64.7 | 57 |
| 1993 | 64.8 | 57 |
| 1992 | 65 | 56 |
| 1991 | 65.1 | 54 |
| 1990 | 65.2 | 53 |
| 1989 | 65.5 | 46 |
| 1988 | 65.7 | 42 |
| 1987 | 65.8 | 40 |
| 1986 | 65.8 | 38 |