| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.01 | 10 |
| 2015 | 81.39 | 9 |
| 2014 | 81.76 | 7 |
| 2013 | 82.12 | 7 |
| 2012 | 82.48 | 7 |
| 2011 | 82.83 | 7 |
| 2010 | 83.18 | 7 |
| 2009 | 83.52 | 7 |
| 2008 | 83.85 | 7 |
| 2007 | 84.18 | 7 |
| 2006 | 84.5 | 7 |
| 2005 | 84.82 | 7 |
| 2004 | 85.13 | 6 |
| 2003 | 85.44 | 5 |
| 2002 | 85.74 | 5 |
| 2001 | 86.03 | 5 |
| 2000 | 86.57 | 5 |
| 1999 | 87.11 | 4 |
| 1998 | 87.64 | 4 |
| 1997 | 88.15 | 4 |
| 1996 | 88.63 | 3 |
| 1995 | 89.11 | 4 |
| 1994 | 89.56 | 4 |
| 1993 | 90 | 4 |
| 1992 | 90.42 | 4 |
| 1991 | 90.82 | 4 |
| 1990 | 91.15 | 4 |
| 1989 | 91.46 | 3 |
| 1988 | 91.76 | 3 |
| 1987 | 92.06 | 3 |
| 1986 | 92.34 | 3 |