| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 95.46 | 14 |
| 2015 | 95.31 | 15 |
| 2014 | 95.15 | 13 |
| 2013 | 94.98 | 13 |
| 2012 | 94.8 | 13 |
| 2011 | 94.61 | 13 |
| 2010 | 94.41 | 13 |
| 2009 | 94.21 | 13 |
| 2008 | 94 | 14 |
| 2007 | 93.78 | 16 |
| 2006 | 93.55 | 16 |
| 2005 | 93.32 | 16 |
| 2004 | 93.08 | 16 |
| 2003 | 92.83 | 16 |
| 2002 | 92.57 | 17 |
| 2001 | 92.3 | 17 |
| 2000 | 92.03 | 18 |
| 1999 | 91.74 | 18 |
| 1998 | 91.45 | 18 |
| 1997 | 91.15 | 18 |
| 1996 | 90.84 | 19 |
| 1995 | 90.54 | 18 |
| 1994 | 90.25 | 18 |
| 1993 | 89.94 | 18 |
| 1992 | 89.63 | 18 |
| 1991 | 89.3 | 18 |
| 1990 | 88.97 | 18 |
| 1989 | 88.63 | 18 |
| 1988 | 88.29 | 18 |
| 1987 | 87.93 | 18 |
| 1986 | 87.56 | 17 |