| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 65.6 | 88 |
| 2015 | 65.6 | 90 |
| 2014 | 65.5 | 97 |
| 2013 | 65.3 | 98 |
| 2012 | 65.2 | 101 |
| 2011 | 65 | 104 |
| 2010 | 64.9 | 104 |
| 2009 | 64.7 | 104 |
| 2008 | 64.5 | 103 |
| 2007 | 64.4 | 100 |
| 2006 | 64.2 | 98 |
| 2005 | 64 | 98 |
| 2004 | 63.7 | 97 |
| 2003 | 63.3 | 94 |
| 2002 | 63 | 94 |
| 2001 | 62.7 | 91 |
| 2000 | 62.4 | 90 |
| 1999 | 61.9 | 91 |
| 1998 | 61.4 | 93 |
| 1997 | 60.9 | 93 |
| 1996 | 60.5 | 94 |
| 1995 | 60.1 | 94 |
| 1994 | 59.5 | 95 |
| 1993 | 58.9 | 96 |
| 1992 | 58.4 | 98 |
| 1991 | 57.9 | 99 |
| 1990 | 57.4 | 103 |
| 1989 | 57 | 102 |
| 1988 | 56.7 | 103 |
| 1987 | 56.4 | 103 |
| 1986 | 56.2 | 103 |