| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 66.84 | 89 |
| 2015 | 66.92 | 86 |
| 2014 | 67.02 | 84 |
| 2013 | 67.13 | 84 |
| 2012 | 67.26 | 84 |
| 2011 | 67.41 | 83 |
| 2010 | 67.55 | 81 |
| 2009 | 67.7 | 80 |
| 2008 | 67.84 | 78 |
| 2007 | 67.98 | 76 |
| 2006 | 68.13 | 73 |
| 2005 | 68.27 | 70 |
| 2004 | 68.41 | 70 |
| 2003 | 68.55 | 70 |
| 2002 | 68.69 | 69 |
| 2001 | 68.77 | 68 |
| 2000 | 68.65 | 68 |
| 1999 | 68.53 | 68 |
| 1998 | 68.41 | 69 |
| 1997 | 68.28 | 69 |
| 1996 | 68.16 | 69 |
| 1995 | 68.04 | 68 |
| 1994 | 67.92 | 68 |
| 1993 | 67.79 | 67 |
| 1992 | 67.6 | 67 |
| 1991 | 67.19 | 68 |
| 1990 | 66.78 | 68 |
| 1989 | 66.36 | 69 |
| 1988 | 65.95 | 69 |
| 1987 | 65.52 | 69 |
| 1986 | 65.1 | 71 |