| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.01 | 2 |
| 2015 | 83.02 | 2 |
| 2014 | 83.04 | 2 |
| 2013 | 82.89 | 2 |
| 2012 | 82.72 | 2 |
| 2011 | 82.54 | 3 |
| 2010 | 82.39 | 3 |
| 2009 | 82.26 | 3 |
| 2008 | 82.19 | 3 |
| 2007 | 82.19 | 3 |
| 2006 | 82.25 | 3 |
| 2005 | 82.38 | 3 |
| 2004 | 82.51 | 3 |
| 2003 | 82.71 | 3 |
| 2002 | 82.93 | 3 |
| 2001 | 83.19 | 1 |
| 2000 | 83.43 | 1 |
| 1999 | 83.75 | 2 |
| 1998 | 84.01 | 1 |
| 1997 | 84.88 | 1 |
| 1996 | 85.68 | 1 |
| 1995 | 86.4 | 1 |
| 1994 | 87.05 | 1 |
| 1993 | 87.65 | 1 |
| 1992 | 88.18 | 1 |
| 1991 | 88.66 | 1 |