| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.83 | 3 |
| 2015 | 83.85 | 3 |
| 2014 | 83.88 | 3 |
| 2013 | 83.92 | 3 |
| 2012 | 83.96 | 3 |
| 2011 | 85.68 | 2 |
| 2010 | 87.16 | 1 |
| 2009 | 86.72 | 1 |
| 2008 | 86.19 | 2 |
| 2007 | 85.57 | 4 |
| 2006 | 84.89 | 4 |
| 2005 | 84.15 | 4 |
| 2004 | 84.19 | 4 |
| 2003 | 84.26 | 5 |
| 2002 | 84.39 | 5 |
| 2001 | 84.19 | 5 |
| 2000 | 84.24 | 5 |
| 1999 | 84.23 | 5 |
| 1998 | 84.18 | 5 |
| 1997 | 84.11 | 5 |
| 1996 | 84.03 | 5 |
| 1995 | 83.96 | 5 |
| 1994 | 83.9 | 5 |
| 1993 | 83.84 | 5 |
| 1992 | 83.83 | 5 |
| 1991 | 83.81 | 5 |
| 1990 | 83.7 | 5 |