| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 94.22 | 18 |
| 2015 | 94.19 | 17 |
| 2014 | 94.17 | 15 |
| 2013 | 94.14 | 15 |
| 2012 | 94.12 | 15 |
| 2011 | 94.1 | 15 |
| 2010 | 94.09 | 15 |
| 2009 | 94.07 | 14 |
| 2008 | 94.06 | 13 |
| 2007 | 94.04 | 13 |
| 2006 | 94.03 | 12 |
| 2005 | 94.02 | 12 |
| 2004 | 94.01 | 12 |
| 2003 | 93.98 | 12 |
| 2002 | 93.93 | 12 |
| 2001 | 93.75 | 12 |
| 2000 | 93.44 | 12 |
| 1999 | 93.12 | 12 |
| 1998 | 92.78 | 13 |
| 1997 | 92.42 | 14 |
| 1996 | 92.05 | 14 |
| 1995 | 91.66 | 14 |
| 1994 | 91.26 | 15 |
| 1993 | 90.84 | 15 |
| 1992 | 90.4 | 17 |
| 1991 | 90.4 | 17 |
| 1990 | 90.4 | 15 |
| 1989 | 90.4 | 15 |
| 1988 | 90.4 | 14 |
| 1987 | 90.4 | 13 |
| 1986 | 89.39 | 16 |