| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 91.65 | 1 |
| 2015 | 91.56 | 1 |
| 2014 | 91.45 | 1 |
| 2013 | 91.33 | 1 |
| 2012 | 91.21 | 1 |
| 2011 | 91.06 | 1 |
| 2010 | 90.91 | 1 |
| 2009 | 90.75 | 1 |
| 2008 | 90.59 | 1 |
| 2007 | 90.43 | 1 |
| 2006 | 90.27 | 2 |
| 2005 | 90.1 | 2 |
| 2004 | 89.93 | 2 |
| 2003 | 89.76 | 2 |
| 2002 | 89.58 | 2 |
| 2001 | 89.4 | 2 |
| 2000 | 89.22 | 2 |
| 1999 | 89.42 | 2 |
| 1998 | 89.67 | 2 |
| 1997 | 89.91 | 2 |
| 1996 | 90.15 | 2 |
| 1995 | 90.38 | 2 |
| 1994 | 90.61 | 3 |
| 1993 | 90.83 | 3 |
| 1992 | 91.05 | 3 |
| 1991 | 91.26 | 3 |
| 1990 | 91.47 | 3 |
| 1989 | 91.32 | 4 |
| 1988 | 91.1 | 4 |
| 1987 | 90.87 | 4 |
| 1986 | 90.64 | 4 |