| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 80.94 | 6 |
| 2015 | 80.92 | 6 |
| 2014 | 80.82 | 6 |
| 2013 | 80.81 | 6 |
| 2012 | 80.81 | 8 |
| 2011 | 80.85 | 7 |
| 2010 | 80.81 | 8 |
| 2009 | 80.84 | 8 |
| 2008 | 80.77 | 7 |
| 2007 | 80.76 | 8 |
| 2006 | 81.52 | 5 |
| 2005 | 80.12 | 7 |
| 2004 | 80.78 | 7 |
| 2003 | 81.42 | 6 |
| 2002 | 80.71 | 7 |
| 2001 | 81.4 | 7 |
| 2000 | 81.1 | 6 |
| 1999 | 81.24 | 6 |
| 1998 | 81.25 | 6 |
| 1997 | 81.39 | 6 |
| 1996 | 81.31 | 6 |
| 1995 | 81.29 | 6 |
| 1994 | 81.27 | 6 |
| 1993 | 80.79 | 6 |
| 1992 | 81.42 | 6 |
| 1991 | 81.03 | 6 |