| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 69.31 | 29 |
| 2015 | 70.14 | 29 |
| 2014 | 70.98 | 29 |
| 2013 | 71.81 | 28 |
| 2012 | 72.65 | 27 |
| 2011 | 73.5 | 27 |
| 2010 | 74.34 | 26 |
| 2009 | 75.17 | 26 |
| 2008 | 76.01 | 26 |
| 2007 | 76.84 | 22 |
| 2006 | 77.66 | 22 |
| 2005 | 78.46 | 17 |
| 2004 | 79.24 | 16 |
| 2003 | 80 | 16 |
| 2002 | 80.74 | 16 |
| 2001 | 81.46 | 15 |
| 2000 | 82.16 | 14 |
| 1999 | 82.83 | 13 |
| 1998 | 83.49 | 13 |
| 1997 | 84.13 | 10 |
| 1996 | 84.59 | 10 |
| 1995 | 84.87 | 10 |
| 1994 | 85.14 | 10 |
| 1993 | 85.41 | 10 |
| 1992 | 85.67 | 9 |
| 1991 | 85.93 | 9 |
| 1990 | 86.19 | 10 |
| 1989 | 86.44 | 11 |
| 1988 | 86.68 | 11 |
| 1987 | 86.93 | 10 |
| 1986 | 87.17 | 10 |