| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.64 | 40 |
| 2015 | 76.76 | 38 |
| 2014 | 76.77 | 38 |
| 2013 | 76.81 | 39 |
| 2012 | 76.83 | 35 |
| 2011 | 76.84 | 37 |
| 2010 | 76.76 | 37 |
| 2009 | 76.46 | 36 |
| 2008 | 76.64 | 39 |
| 2007 | 76.86 | 40 |
| 2006 | 77.16 | 38 |
| 2005 | 77.54 | 35 |
| 2004 | 77.94 | 34 |
| 2003 | 78.32 | 30 |
| 2002 | 78.71 | 30 |
| 2001 | 79.1 | 32 |
| 2000 | 79.51 | 29 |
| 1999 | 79.94 | 27 |
| 1998 | 80.39 | 26 |
| 1997 | 80.85 | 26 |
| 1996 | 81.31 | 25 |
| 1995 | 81.76 | 24 |
| 1994 | 82.13 | 23 |
| 1993 | 82.5 | 24 |
| 1992 | 82.85 | 23 |
| 1991 | 83.2 | 22 |