| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.59 | 12 |
| 2015 | 83.86 | 12 |
| 2014 | 83.95 | 12 |
| 2013 | 83.81 | 12 |
| 2012 | 84.8 | 12 |
| 2011 | 84.23 | 10 |
| 2010 | 85.07 | 10 |
| 2009 | 85.83 | 9 |
| 2008 | 85.86 | 10 |
| 2007 | 85.2 | 11 |
| 2006 | 85.58 | 10 |
| 2005 | 85.94 | 9 |
| 2004 | 87.24 | 6 |
| 2003 | 86.48 | 8 |
| 2002 | 87.08 | 7 |
| 2001 | 86.37 | 8 |
| 2000 | 88.3 | 4 |
| 1999 | 88.73 | 3 |
| 1998 | 87.69 | 5 |
| 1997 | 87.15 | 7 |
| 1996 | 86.59 | 10 |
| 1995 | 88.08 | 4 |
| 1994 | 88.03 | 4 |
| 1993 | 87.94 | 5 |
| 1992 | 87.79 | 6 |
| 1991 | 88.33 | 8 |