| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 86.96 | 3 |
| 2015 | 87 | 3 |
| 2014 | 87.02 | 3 |
| 2013 | 87.02 | 3 |
| 2012 | 87.02 | 3 |
| 2011 | 87 | 3 |
| 2010 | 86.98 | 3 |
| 2009 | 86.96 | 3 |
| 2008 | 86.95 | 3 |
| 2007 | 86.93 | 3 |
| 2006 | 86.91 | 3 |
| 2005 | 86.89 | 4 |
| 2004 | 86.87 | 4 |
| 2003 | 86.85 | 4 |
| 2002 | 86.84 | 4 |
| 2001 | 86.82 | 4 |
| 2000 | 86.8 | 4 |
| 1999 | 86.63 | 5 |
| 1998 | 86.45 | 6 |
| 1997 | 86.28 | 6 |
| 1996 | 86.1 | 7 |
| 1995 | 85.92 | 8 |
| 1994 | 85.74 | 8 |
| 1993 | 85.56 | 9 |
| 1992 | 85.37 | 10 |
| 1991 | 85.18 | 12 |
| 1990 | 85.01 | 12 |
| 1989 | 85.21 | 12 |
| 1988 | 85.41 | 12 |
| 1987 | 85.61 | 13 |
| 1986 | 85.81 | 14 |