| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 88.84 | 30 |
| 2015 | 88.78 | 30 |
| 2014 | 88.72 | 28 |
| 2013 | 88.67 | 28 |
| 2012 | 88.62 | 27 |
| 2011 | 88.58 | 27 |
| 2010 | 88.54 | 27 |
| 2009 | 88.5 | 25 |
| 2008 | 88.47 | 25 |
| 2007 | 88.44 | 24 |
| 2006 | 88.42 | 23 |
| 2005 | 88.4 | 23 |
| 2004 | 88.39 | 23 |
| 2003 | 88.38 | 23 |
| 2002 | 88.37 | 24 |
| 2001 | 88.37 | 23 |
| 2000 | 88.37 | 23 |
| 1999 | 88.38 | 22 |
| 1998 | 88.38 | 22 |
| 1997 | 88.38 | 22 |
| 1996 | 88.39 | 20 |
| 1995 | 88.39 | 20 |
| 1994 | 88.39 | 20 |
| 1993 | 88.4 | 20 |
| 1992 | 88.4 | 20 |
| 1991 | 88.33 | 19 |
| 1990 | 88.14 | 19 |
| 1989 | 87.95 | 19 |
| 1988 | 87.75 | 19 |
| 1987 | 87.56 | 19 |
| 1986 | 87.36 | 18 |