| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.24 | 28 |
| 2015 | 83.29 | 26 |
| 2014 | 83.35 | 26 |
| 2013 | 83.37 | 26 |
| 2012 | 84.16 | 20 |
| 2011 | 84.57 | 18 |
| 2010 | 85.98 | 14 |
| 2009 | 87.26 | 13 |
| 2008 | 88.42 | 10 |
| 2007 | 89.45 | 9 |
| 2006 | 90.37 | 6 |
| 2005 | 90.58 | 7 |
| 2004 | 90.73 | 5 |
| 2003 | 90.81 | 4 |
| 2002 | 90.83 | 4 |
| 2001 | 90.8 | 4 |
| 2000 | 90.82 | 5 |
| 1999 | 90.86 | 5 |
| 1998 | 90.91 | 6 |
| 1997 | 90.98 | 6 |
| 1996 | 91.06 | 7 |
| 1995 | 91.14 | 7 |
| 1994 | 91.23 | 7 |
| 1993 | 91.33 | 6 |
| 1992 | 91.44 | 5 |
| 1991 | 91.54 | 5 |
| 1990 | 91.64 | 4 |