| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.64 | 16 |
| 2015 | 81.83 | 16 |
| 2014 | 82.1 | 14 |
| 2013 | 81.66 | 15 |
| 2012 | 82.2 | 15 |
| 2011 | 82.39 | 15 |
| 2010 | 84.16 | 11 |
| 2009 | 85.68 | 11 |
| 2008 | 86.87 | 6 |
| 2007 | 88.17 | 2 |
| 2006 | 88.41 | 2 |
| 2005 | 88.57 | 3 |
| 2004 | 88.94 | 2 |
| 2003 | 88.78 | 2 |
| 2002 | 88.43 | 2 |
| 2001 | 87.4 | 4 |
| 2000 | 88.61 | 3 |
| 1999 | 88.67 | 4 |
| 1998 | 88.62 | 3 |
| 1997 | 88.64 | 3 |
| 1996 | 88.9 | 3 |
| 1995 | 88.82 | 3 |
| 1994 | 88.53 | 3 |
| 1993 | 88.57 | 3 |
| 1992 | 88.58 | 3 |
| 1991 | 88.84 | 3 |