| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.34 | 5 |
| 2015 | 82.32 | 5 |
| 2014 | 82.31 | 4 |
| 2013 | 82.11 | 5 |
| 2012 | 81.89 | 6 |
| 2011 | 81.67 | 5 |
| 2010 | 81.5 | 6 |
| 2009 | 81.35 | 7 |
| 2008 | 81.28 | 6 |
| 2007 | 81.29 | 5 |
| 2006 | 81.38 | 6 |
| 2005 | 81.54 | 6 |
| 2004 | 81.75 | 6 |
| 2003 | 82.05 | 5 |
| 2002 | 82.39 | 4 |
| 2001 | 82.76 | 2 |
| 2000 | 83.1 | 3 |
| 1999 | 83.49 | 5 |
| 1998 | 83.81 | 3 |
| 1997 | 84.69 | 3 |
| 1996 | 85.51 | 3 |
| 1995 | 86.24 | 2 |
| 1994 | 86.96 | 1 |
| 1993 | 87.63 | 1 |
| 1992 | 88.2 | 1 |
| 1991 | 88.71 | 1 |