| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.51 | 60 |
| 2015 | 77.2 | 60 |
| 2014 | 76.89 | 59 |
| 2013 | 76.56 | 59 |
| 2012 | 76.22 | 57 |
| 2011 | 75.87 | 57 |
| 2010 | 75.51 | 57 |
| 2009 | 75.13 | 57 |
| 2008 | 74.75 | 57 |
| 2007 | 74.35 | 57 |
| 2006 | 73.93 | 57 |
| 2005 | 73.5 | 59 |
| 2004 | 73.06 | 62 |
| 2003 | 72.61 | 63 |
| 2002 | 72.14 | 63 |
| 2001 | 71.65 | 62 |
| 2000 | 71.16 | 63 |
| 1999 | 70.67 | 63 |
| 1998 | 70.17 | 64 |
| 1997 | 69.67 | 65 |
| 1996 | 69.16 | 65 |
| 1995 | 68.64 | 67 |
| 1994 | 68.13 | 67 |
| 1993 | 67.6 | 68 |
| 1992 | 67.08 | 69 |
| 1991 | 66.53 | 73 |
| 1990 | 65.83 | 75 |
| 1989 | 65.13 | 75 |
| 1988 | 64.42 | 75 |
| 1987 | 63.7 | 75 |
| 1986 | 62.98 | 74 |