| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 64.97 | 41 |
| 2015 | 65.72 | 41 |
| 2014 | 66.48 | 39 |
| 2013 | 67.25 | 39 |
| 2012 | 68.01 | 38 |
| 2011 | 68.78 | 36 |
| 2010 | 69.54 | 34 |
| 2009 | 70.29 | 33 |
| 2008 | 71.03 | 33 |
| 2007 | 71.76 | 33 |
| 2006 | 72.48 | 30 |
| 2005 | 73.19 | 30 |
| 2004 | 73.89 | 29 |
| 2003 | 74.57 | 30 |
| 2002 | 75.24 | 28 |
| 2001 | 75.9 | 28 |
| 2000 | 76.41 | 28 |
| 1999 | 76.8 | 28 |
| 1998 | 77.18 | 25 |
| 1997 | 77.56 | 26 |
| 1996 | 77.94 | 26 |
| 1995 | 78.31 | 26 |
| 1994 | 78.67 | 24 |
| 1993 | 79.03 | 24 |
| 1992 | 79.39 | 24 |
| 1991 | 79.74 | 24 |
| 1990 | 80.19 | 24 |
| 1989 | 80.67 | 24 |
| 1988 | 81.14 | 24 |
| 1987 | 81.61 | 23 |
| 1986 | 82.06 | 23 |